Internet Draft Adams, Sylvester, Zolotarev, Zuccherato PKIX Working Group October 5, 2000 expires April 5, 2001 Internet X.509 Public Key Infrastructure Data Validation and Certification Server Protocols Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. Abstract This document describes a general Data Validation and Certification Server (DVCS) and the protocols to be used when communicating with it. The Data Validation and Certification Server is a Trusted Third Party (TTP) that can be used as one component in building reliable non-repudiation services (see [ISONR]). Useful Data Validation and Certification Server responsibilities in a PKI are to assert the validity of signed documents, public key certificates, and the possession or existence of data. Assertions created by this protocol are called Data Validation Certificates (DVC). We give examples of how to use the Data Validation and Certification Server to extend the lifetime of a signature beyond key expiry or revocation and to query the Data Validation and Certification Server Adams, Sylvester, Zolotarev, Zuccherato [Page 1] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 regarding the status of a public key certificate. The document includes a complete example of a time stamping transaction. The key words "MUST", "MUST NOT", "REQUIRED", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document (in uppercase, as shown) are to be interpreted as described in [RFC2119]. 1. Introduction This document is the result of work that has been proposed and discussed within the IETF PKIX working group. The authors and some members of the group felt that promoting the rather new concepts into the standards process seemed premature. The concepts presented have been stable for some time and partially implemented. It was agreed that a publication as experimental RFC was an appropriate means to get a stable reference document to permit other implementations to occur. A Data Validation and Certification Server (DVCS) is a Trusted Third Party (TTP) providing data validation services, asserting correctness of digitally signed documents, validity of public key certificates, and possession or existence of data. As a result of the validation, a DVCS generates a Data Validation Certificate (DVC) The data validation certificate can be used for constructing evidence of non-repudiation relating to the validity and correctness of an entity's claim to possess data, the validity and revocation status of an entity's public key certificate and the validity and correctness of a digitally signed document. Services provided by a DVCS do not replace the usage of CRLs and OCSP for public key certificate revocation checking in large open environments, due to concerns about the scalability of the protocol. It should be rather used to support non-repudiation or to supplement more traditional services concerning paperless document environments. The presence of a data validation certificate supports non- repudiation by providing evidence that a digitally signed document or public key certificate was valid at the time indicated in the DVC. A DVC validating a public key certificate can for example be used even after the public key certificate expires and its revocation information is no longer or not easily available. Determining the validity of a DVC is assumed to be a simpler task, for example, if the population of DVCS is significantly smaller than the population of public certificate owners. Adams, Sylvester, Zolotarev, Zuccherato [Page 2] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 An important feature of the protocol is that DVCs can be validated by using the same protocol (not necessarily using the same service), and the validity of a signed document, in particular a DVC, can also be determined by means other than by verifying its signature(s), e.g. by comparing against an archive. The production of a data validation certificate in response to a signed request for validation of a signed document or public key certificate also provides evidence that due diligence was performed by the requester in validating a digital signature or public key certificate. This document defines the use of digital signatures to insure the authenticity of documents and DVCs, and uses a corresponding terminology; the use of other methods to provide evidence for authenticity is not excluded, in particular it is possible to replace a SignedData security envelope by another. 2. Services provided by DVCS The current specification defines 4 types of validation and certification services: - Certification of Possession of Data (cpd), - Certification of Claim of Possession of Data (ccpd), - Validation of Digitally Signed Document (vsd), and - Validation of Public Key Certificates (vpkc). A DVCS MUST support at least a subset of these services. A DVCS may support a restructed vsd service allowing to validate data validation certificates. On completion of each service, the DVCS produces a data validation certificate - a signed document containing the validation results and trustworthy time information. 2.1 Certification Possession of Data The Certification of Possession of Data service provides evidence that the requester possessed data at the time indicated and that the actual data where presented to the Data Validation Server. 2.2 Certification of Claim of Possession of Data The Certification Claim of Possession of Data service is similar to the previous one, except that the requester does not present the data itself but a message digest. Adams, Sylvester, Zolotarev, Zuccherato [Page 3] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 2.3 Validation of Digitally Signed Documents The Validation of Digitally Signed Document service is used when validity of a signed document is to be asserted. The DVCS verifies all signatures attached to the signed document using all appropriate status information and public key certificates. The DVCS verifies the mathematical correctness of all signatures attached to the document and also checks whether the signing entities can be trusted, for example by validating the full certification path from the signing entities to a trusted point (e.g., the DVCS's CA, or the root CA in a hierarchy). The DVCS may be able to rely on relevant CRLs or may need to supplement this with access to more current status information from the CAs for example by accessing to an OCSP service, a trusted directory service, or other DVCS services. The DVCS will perform verification of all signatures attached to the signed document. A failure of the verification of one of the signatures does not necessarily result in the failure of the entire validation, and vice versa, a global failure may occur if the document has an insufficient number of signatures. 2.4 Validation of Public Key Certificates The Validation of Public Key Certificates service is used to verify and assert the validity (according to [RFC2459]) of one or more public key certificates at the specified time. When verifying a public key certificate, the DVCS verifies that the certificate included in the request is a valid certificate and determines its revocation status at a specified time. DVS checks the full certification path from the certificate's issuer to a trusted point. Again, the DVCS MAY be able to rely on external information (CRL, OCSP, DVCS). 3. Data Certification Server Usage and Scenarii. It is outside the scope of this document to completely describe different operational scenarii or usages for DVCS. See Appendix B and C for a set of some basic examples and use cases. The Validate Signed Document service can be used to support non- repudiation services, to allow use of the signed document beyond public key certificate revocation or expiry, or simply to delegate signature validation to a trusted central (company wide) service. Adams, Sylvester, Zolotarev, Zuccherato [Page 4] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 The Validate Public Key Certificate service can be used when timely information regarding a certificate's revocation status is required (e.g. high value funds transfer or the compromise of a highly sensitive key) or when evidence supporting non-repudiation is required. A data validation certificate may be used to simplify the validation of a signature beyond the expiry or subsequent revocation of the signing certificate: a Data validation certificate used as an authenticated attribute in a signature includes an additional assertion about the usability of a certificate that was used for signing. In order to validate such a signature it may be sufficient to only validate the data validation certificate. A DVCS may include additional key exchange certificates in a data validation certificate to validate a key exchange certificate in order to provide to an application a set of additional authorised recipients for which a session key should also be encrypted. This can be used for example to provide central management of a company wide recovery scheme. Note, that the additional certificates may not only depend on the requested certificate, but also on the requester's identity. The Certification of Claim of Possession of Data service is also known as time stamping. The Certification of Possession of Data service can be used to assert legal deposit of documents, or to implement archival services as a trusted third party service. The Data Validation and Certification Server Protocols can be used in different service contexts. Examples include company-wide centralised services (verification of signatures, certification of company certificates), service to cooperate in a multi-organisation community, or general third party services for time stamping or data archival. An important application of DVCS is an enterprise environment where all security decision are based on company wide rules. A company wide DVCS service can be used to delegate all technical decisions (e.g., path validation, trust configuration) to a centrally managed service. In all cases, the trust that PKI entities have in the Data Validation and Certification Server is transferred to the contents of the Data Validation Certificate (just as trust in a CA is transferred to the public key certificates that it issues). Adams, Sylvester, Zolotarev, Zuccherato [Page 5] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 A DVCS service may be combined with or use archiving and logging systems, in order to serve as a strong building block in non- repudiation services. In this sense it can be regarded as an Evidence Recording Authority [ISO-NR]. 4. Functional Requirements for DVCS The DVCS MUST 1. provide a signed response in the form of a data validation certificate to the requester, as defined by policy, or an error response. The DVCS service definition and the policy define how much information that has been used by the DVCS to generate the response will be included in a data validation certificate, e.g., public key certificates, CRLs, and responses from other OCSP servers, TSA and DVCS. 2. indicate in the data validation certificate whether or not the signed document, the public key certificate(s), or the data were validated, and, if not, the reason why the verification failed. 3. include a strictly monotonously increasing serial number in each data validation certificate. 4. include a time of day value or a time stamp token into each data validation certificate. 5. sign each data certification token using a key that has been certified with a dvcs signing extended key purpose, and include a reference to this certificate as a signed attributes in the signature. 6. check the validity of its own signing key and certificate before delivering data validation certificates and MUST not deliver data validation certificate in case of failure. A DVCS SHOULD include within each data validation certificate a policy identifier to determine the trust and validation policy used for DVC's signature. 5. Data Certification Server Transactions A DVCS transaction begins with a client preparing a Data Validation and Certification Request. The request always contains data for which validity, correctness or possession is to be certified. The request MAY be encapsulated using a security envelope to provide Adams, Sylvester, Zolotarev, Zuccherato [Page 6] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 for authentication of both requester and server. requester authentication can be achieved by several of the formats described in CMS, in particular, signedData. The DVCS client chooses an appropriate transport mechanism to convey the requests to a DVCS. It may also be necessary to choose a transport mechanism providing confidentiality and, in particular, allowing authentication of the DVCS by the requestor, e.g. TLS or CMS or S/MIME encryption. If the request is valid, the DVCS performs all necessary verifications steps, and generates a Data Validation Certificate (DVC), and sends a response message containing the DVC back to the requestor. The Data Validation Certificate is formed as a signed document (CMS SignedData). As with the request, it may be necessary to choose a transport mechanism that provides for confidentiality to carry the DVC. DVCs are do not necessarily transported the same way as requests, e.g. they can be returned using e-mail after an online request received via HTTPS. If the request was invalid, the DVCS generates a response message containing an appropriate error notification. Upon receiving the response, the requesting entity SHOULD verify its validity, i.e. whether it contains an acceptable time, the correct name for the DVCS, the correct request information and message imprint, a valid signature, and satisfactory status, service and policy fields. When verifying the validity of a DVC, it is up to the requestor's application to check whether a DVCS's signing certificate is valid. Depending on the usage environment, different methods, online or out of band, e.g., CRLs, DVCS, or OCSP, may have to be used. After all checks passed, the data validation certificate can be used to authenticate the correctness or possession of the corresponding data. A DVCS may return more than one DVC corresponding to one request. In this case, all but one request have a global status of 'WAITING'. 6. Identification of the DVCS In order to be able to import elements from dvcs the following object Adams, Sylvester, Zolotarev, Zuccherato [Page 7] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 identifier is used as a ASN.1 module identifier. id-mod-dvcs OBJECT IDENTIFIER ::= {iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) 15} The DVCS that use SignedData to provide authentication for DVCs MUST sign all data certification messages with a key whose corresponding certificate MUST contain the extended key usage field extension as defined in [RFC2459] Section 4.2.1.14 with KeyPurposeID having value id-kp-dvcs. This extension MUST be marked as critical. The Data Validation Certificate MUST contain an ESSCertID authenticated attribute for the certificate used by the DVCS for signing. id-kp-dvcs OBJECT IDENTIFIER ::= { iso(1) identified- organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) kp(3) 10 } Consistent KeyUsage bits: digitalSignature, nonRepudiation, keyCertSign, cRLSign A DVCS's certificate MAY contain an Authority Information Access extension [RFC2459] in order to convey the method of contacting the DVCS. The accessMethod field in this extension MUST contain the OID id-ad-dvcs: id-ad-dvcs OBJECT IDENTIFIER ::= {iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) ad(48) 4} The value of the field 'accessLocation' field defines the transport (e.g., an URI) used to access the DVCS. 7. Common Data Types There are several common data types that occur in the request and the response data structures. These data types are either defined by this document or imported from other sources. This chapter defines and describes these types and lists their usages. 7.1 Version: The request and the response include an optional integer field specifying the version of the data structure. For both fields the value is 1, or the field is not present at all in this version of the Adams, Sylvester, Zolotarev, Zuccherato [Page 8] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 protocol. 7.2 DigestInfo: This element is defined in [RFC2315]. Since the status of that document is informational, the definition is repeated here: DigestInfo ::= SEQUENCE { digestAlgorithm DigestAlgorithmIdentifier, digest Digest } Digest ::= OCTET STRING The fields of type DigestInfo have the following meanings: - The field 'digestAlgorithm' identifies the message-digest algorithm (and any associated parameters) under which data are digested. - The field 'digest' is the result of the message-digesting process. A DigestInfo is used in two places: - as a data portion for the ccpd service, and - in all a data validation certificates to hold a digest of the data portion of the corresponding request or a copy of the data field for a ccpd service. 7.3. Time Values Indicators of time can be present in requests and responses. In the most simple form, the time is represented as GeneralizedTime where fractions of seconds are allowed. An alternate form is a timeStampToken from a TSA, or as a DVC (or some other token) from another third party service. It is a matter of policy whether a DVCS tries to interprete or validate a Time Value in a request. DVCSTime ::= CHOICE { genTime GeneralizedTime, timeStampToken ContentInfo } Future versions of the protocol MAY include additional time formats. Adams, Sylvester, Zolotarev, Zuccherato [Page 9] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 Time values generated by the DVCS are increasing but not necessarily unique, an order among DVCs is defined by serial numbers. 7.4. PKIStatusInfo This structure is defined in [RFC2510]. It is used as component of the 'chain' field of a TargetEtcChain structure, and as a global status indicator in the DVCSResponse structure. Every occurrence of PKIStatusInfo is generated by the responding DVCS to reflect the result of some local verification. 7.5. TargetEtcChain A TargetEtcChain structure contains certificates and other indicators to describe either (in a request for a cpkc service) information to be validated, or the result of the verifications. The structure may also contain information about policies and policy mappings. The details about how to fill in and to interpret the structure are defined later for each service. The 'pathProcInput' field contains information about policies and policy mapping to be used or used during a validation. In a response, the 'pkistatus' and 'certstatus' choices can only occur in in the 'chain' sequence. If present, they contain the result of a local verification of the immediately preceding element, or of the target value, if it is the first element in the 'chain' sequence. If no 'pkistatus' or 'certstatus' is present, the DVCS considers all elements in the 'chain' as trustworthy. Note, that there may be valid OCSP response or DVC indicating an invalid certificate. TargetEtcChain ::= SEQUENCE { target CertEtcToken, chain SEQUENCE SIZE (1..MAX) OF CertEtcToken OPTIONAL, pathProcInput [0] PathProcInput OPTIONAL } PathProcInput ::= SEQUENCE { acceptablePolicySet SEQUENCE SIZE (1..MAX) OF PolicyInformation, inhibitPolicyMapping BOOLEAN DEFAULT FALSE, explicitPolicyReqd BOOLEAN DEFAULT FALSE } CertEtcToken ::= CHOICE { Adams, Sylvester, Zolotarev, Zuccherato [Page 10] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 certificate [0] IMPLICIT Certificate , esscertid [1] ESSCertId , pkistatus [2] IMPLICIT PKIStatusInfo , assertion [3] ContentInfo , crl [4] IMPLICIT CertificateList, ocspcertstatus [5] IMPLICIT CertStatus, oscpcertid [6] IMPLICIT CertId , oscpresponse [7] IMPLICIT OCSPResponse, capabilities [8] SMIMECapabilities, extension Extension } Certificate, PolicyInformation and CertificateList are defined in [RFC2459]. ESSCertId is defined in [RFC2634]. CertId, OCSPResponse and CertStatus are defined in [RFC2560]. PKIStatusField is defined in [RFC2510]. The choice 'assertion' can contain a data validation certificate, or a timeStamp, or other assertions. The choices 'assertion', 'ocspresponse' and 'crl' are provided by services external to the responding DVCS. The choices 'certStatus' and 'pkistatus' reflect decisions made directly by the responding DVCS. As a replacement for certificates, certification identifiers (ESSCertId, CertId) MAY be used in requests and responses, if this is sufficient to perform the service, e.g., when the corresponding certificates are provided elsewhere in a request or response (as part of the SignedData type). Certificate or certification identifiers of certification authorities MAY occur in any order and MAY represent several certification chains. The choice 'capablities' can be used to indicate SMIMECapabilities. It applies to the certificate identified by the preceding element in the sequence. 7.6. DVCSRequestInformation A DVCSRequestInformation data structure contains general information about the Data Validation and Certification Request. This structure occurs in a request, and is also included in a corresponding Data Validation Certificate. DVCSRequestInformation ::= SEQUENCE { Adams, Sylvester, Zolotarev, Zuccherato [Page 11] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 version INTEGER DEFAULT 1 , service ServiceType, nonce INTEGER OPTIONAL, requestTime DVCSTime OPTIONAL, requester [0] GeneralNames OPTIONAL, requestPolicy [1] PolicyInformation OPTIONAL, dvcs [2] GeneralNames OPTIONAL, dataLocations [3] GeneralNames OPTIONAL, extensions [4] IMPLICIT Extensions OPTIONAL } The ServiceType type enumerates the DVCS service type of a request. See chapter 2 for the description of the services. ServiceType ::= ENUMERATED { cpd(1), vsd(2), cpkc(3), ccpd(4) } 7.7. GeneralName and GeneralNames There are several occurences of SEQUENCES of GeneralName and GeneralNames These structures are imported from [RFC2459]. 8. Data Validation and Certification Requests A Data Validation and Certification request is a ContentInfo defined in [RFC2630]. It may consists of a [RFC2630] content with a contenttype id-ct- DVCSRequestData signalling a DVCSRequestData, id-ct-DVCSRequestData OBJECT IDENTIFIER ::= { iso(1) member- body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) ct(1) 7 } These data are optionally encapsulated by contenttypes that provide for authentication and/or confidentiality. This document describes the usage of a SignedData construct of [RFC2630] where the contenttype indicated in the eContentType of the encapContentInfo is id-ct-DVCSRequestData and the eContent of the encapContentInfo, carried as an octet string, contains a DVCSRequestData structure. When using a SignedData structure, a Data Validation and Certification Request MAY contain several SignerInfo structures, and countersignature attributes depending on operational environments. When an end user client creates the request, there is one or zero SignerInfo. A relaying DVCS MAY add an additional signature or a Adams, Sylvester, Zolotarev, Zuccherato [Page 12] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 countersignature attribute, or MAY use another encapsulation from [RFC2630] that provides for authentication and/or confidentiality. The content of a request consists of a description of the desired service and additional parameters, the data to be validated, and an optional identifier of the request. DVCSRequest ::= SEQUENCE { requestInformation DVCSRequestInformation, data Data, transactionIdentifier GeneralName OPTIONAL } The 'DVCSRequest.requestInformation' element contains general information about the request. It is filled in by the requester as follows: - The 'version' field is set to 1 or the field is absent in this version of the protocol. The field 'service' contains the requested service. - The 'nonce' field MAY be used to provide additional protection against replay or content guessing attacks. - The 'requestTime' field MAY be used to indicate the time for which the requested service should be performed. For a vsd and cpkc service, it specifies the time for which the validity of a signed document or certicates is to be asserted. For the other service, the field is ignored by the DVCS. If the field is absent, the current time is assumed. - The value of the 'requester' field indicates the requesting entity. The interpretation and usage of this field MUST be defined by the DVCS policy. Some usage example are: If the field is present, and the request is signed, a DVCS MAY for example require that the field MUST match the identity (subjectName or subjectAltName extension) of the corresponding signature certificate, A request MAY be signed by a DVCS when relaying it to another DVCS. When acting as a relay, a DVCS MAY add its own identity in the request relayed to another service provider, and it MAY remove the Adams, Sylvester, Zolotarev, Zuccherato [Page 13] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 initial value. - The 'requestPolicy' field SHOULD indicate the policy under which the validation is requested. This field MUST be checked by the DVCS to verify agreement with its own policy. The absence of this field indicates that any policy is acceptable. - The 'dvcs' field MAY be used to indicate a list a DVCS which can be contacted to provide (additional) information or to perform additional operations necessary to produce the response. It is up to the DVCS policy whether to honor this field or not, and to define which choice of a general name is acceptable (e.g. an URL or a DN). - The 'dataLocations' field MAY be used to indicate where a copy of the 'data' field of the request or supplementary information can be obtained. The DVCS does not use this field for its own operation, the exact interpretation of this field is defined by applications. - The 'requestTime' field MAY be used to indicate the time for which the requested service should be performed. For a vsd and cpkc service, it specifies the time for which the validity of a signed document or certicates is to be asserted. For the other service, the field is ignored by the DVCS. If the field is absent, the current time is assumed. The DVCS service may have a time limit or a delta time limit regarding current time which are specified in the local policy of the DVCS service. - The 'extensions' field MAY be used to include additional information. Extensions may be marked critical or not in order to indicate whether the DVCS is supposed to understand them. This document does not define extensions. The DVCSRequest.data contains service-specific content, defined by each particular service provided by the DVCS. Depending on the requested service type, the field may contain a signed document, a list of certificates, a message digest or arbitrary data. The following type is used: Data ::= CHOICE { message OCTET STRING , messageImprint DigestInfo, Adams, Sylvester, Zolotarev, Zuccherato [Page 14] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 certs SEQUENCE SIZE (1..MAX) OF TargetEtcChain } The requester fills the 'data' element as follows: - For a vsd service request, the requestor encapsulates a CMS SignedData object in the value octets of the 'message' choice. It is up to the requester to decide whether and how to provide any certificate that may be needed to verify the signature(s) in the signedData object. A requester MAY add certificates to the encapsulated signedData object or in the certificate list of the request. - For a cpkc service request the 'certs' choice is used. Each certificate to be verified MUST be included in a separate instance of TargetEtcChain, and to be verified. The 'TargetEtcChain.chain' field, if present, indicate one or more chains of trust that can be used to validate the certificate. The DVCS MAY choose to select a subset of certificates as certification path, or to ignore this field. The 'TargetEtcChain.pathProcInput' field, if present, indicates the acceptable policy set and initial settings for explicit-policy-indicator and inhibit-policy-mapping indicators to be used in X.509 public key certificate path validation (see [RFC2459]). Only the Certificate, ESSCertId, CertId or Extension choices of the TargetEtcChain can be used in the request. The requester is responsible for providing sufficient information to the DVCS to identify the corresponding certificates. - For a ccpd service the 'messageImprint' choice is used. The hash algorithm indicated in the hashAlgorithm field SHOULD be a "strong" hash algorithm (that is, it SHOULD be one-way and collision resistant). It is up to the Data Certification Server to decide whether or not the given hash algorithm is sufficiently "strong" (based on the current state of knowledge in cryptanalysis and the current state of the art in computational resources, for example). - For a cpd service the 'message' choice is used. The field contains requester-specific data with any type of Adams, Sylvester, Zolotarev, Zuccherato [Page 15] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 content. The DVCS does not inspect, modify, or take any particular action based on the particular content of the 'message' field. The field 'DVCSRequest.transactionIdentifier' MAY be used in order to associate DVCS responses containing error messages, to requests. For example, in a mail based environment, the parameter could be a copy of a messageid. Note, that the transactionIdentifier is not necessary for associating a request with a valid data validation certificate. 9. DVCS Responses This chapters describes the data structures that are created by a DVCS to indicate the results of validation and certification requests. A DVCS Response structure is generated by the DVCS as a result of processing of the data validation and certification request. A Data Validation resonse contain an [RFC2630] ContentInfo with a type of id-ct-DVCSResponseData signalling a DVCSResponse structure. id-ct-DVCSResponseData OBJECT IDENTIFIER ::= { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) ct(1) 8 } The data MAY be encapsulated by constructs of [RFC2630] in order to provide authentication of the DVCS, and or integrity and confidentiality of the request. This document specifies the usage of a SignedData construct of [RFC2630]. The contenttype indicated in the eContentType of the encapContentInfo is of type id-ct-DVCSResponseData, signalling a DVCSResponse as eContent of the encapContentInfo (carried as an octet string). The DVCS SHOULD use a key for which a corresponding certificate indicates in an extendedKeyUsage the purpose of DVCS signing. In a critical situation when a DVCS cannot produce a valid signature (if the DVCS's signing key is known to be compromised, for example), the DVCSResponse, containing the error notification, MUST be generated as a signedData with no signerInfo attached. Receiving unsigned DVCSResponse MUST be treated by the clients as critical and fatal error, and the content of the message should not be implicitly trusted. A valid response can contain one of the following: 1. A Data Validation Certificate (DVC), delivering the results of Adams, Sylvester, Zolotarev, Zuccherato [Page 16] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 data validation operations, performed by the DVCS. 2. An error notification. This may happen when a request fails due to a parsing error, requester authentication failure, or anything else that prevented the DVCS from executing the request. The following type is used: DVCSResponse ::= CHOICE { dvCertInfo DVCSCertInfo , dvErrorNote [0] DVCSErrorNotice } 9.1. Data Validation Certificate A Data Validation Certificate is a signedData object containing a DVCSResponse with a 'dvCertInfo' choice. DVCSCertInfo::= SEQUENCE { version Integer DEFAULT 1 , dvReqInfo DVCSRequestInformation, messageImprint DigestInfo, serialNumber Integer, responseTime DVCSTime, dvStatus [0] PKIStatusInfo OPTIONAL, policy [1] PolicyInformation OPTIONAL, reqSignature [2] SignerInfos OPTIONAL, certs [3] SEQUENCE SIZE (1..MAX) OF TargetEtcChain OPTIONAL, extensions Extensions OPTIONAL } The DVCSCertInfo structure is returned as a result of successful execution of data validation service. It contains the results of the data validation, a reference to the original request, and other parameters. Please note that 'successful execution' does not necessarily mean that the validation itself was successful - a DVCSCertInfo may contain both the 'valid' and 'invalid' results. The DVCS creates a DVCSCertInfo as follows: - The 'version' field is never present in this version of the protocol. The 'dvReqInfo' is essentially a copy of the 'requestInformation' field of the corresponding request. The DVCS MAY modify the fields 'dvcs', 'requester' and 'dataLocations', and 'nonce' of the ReqInfo Adams, Sylvester, Zolotarev, Zuccherato [Page 17] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 structure, e.g., if the request was processed by a chain of DVCS, if the request to indicate DVCS, or to indicate where to find a copy of the data from a 'vpd' request. The only modification allowed to a 'nonce' is the inclusion of a new field if it was not present, or to concatenate other data to the end (right) of an existing value. - The 'DVCSCertInfo.messageImprint' field is computed from the 'data' field of the corresponding request as follows: For the 'certs' choice (the 'vpkc' service), the digest is computed over the DER encoded data value. For a 'message' choice (the 'vsd' and the 'vpd' services) the digest is computed over the value octets (not including tag and length octets) of the OCTET STRING. It is up to the DVCS to choose an appropriate digest algorithm. For a 'messageImprint' choice (the 'vcpd' service), the 'messageImprint' of the DVCSRequest is copied as is. - The 'DVCSCertInfo.serialNumber' field contains a unique identifier of the request. - The field 'responseTime' indicates a time value associated to the response. The value MAY be a locally generated one, or a signed TimeStampToken (TST) or DVC obtained from an external service. Before using a value obtained from an external service, the DVCS must validate it according the rules of the external service. - The field 'DVCSCertInfo.dvStatus' reflects a collective result of the validation. If the field is missing, it is an equvivalent of the SUCCESS status. For a vkpc, if the status field is present and set to SUCCESS, it indicates that all certificates were successfully validated. If it is present and set to FAILED, it indicates that all or some of the certificates failed validation, and the specific status of the 'certs' should be investigated, at least of the elements of the 'certs' TargetEtcChain structures MUST have a failure status. If the field 'dvStatus' does not indicate success ('granted' or 'granted with mods') the element 'failInfo' MAY indicate the reason for the failure. Note that the field 'certs' MAY contain additional information about verification failures. Adams, Sylvester, Zolotarev, Zuccherato [Page 18] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 A failure of the verification of one of the signatures does not necessarily result in failing to validate a signed document. For example, as long as a sufficient number of signature was successfully verified, a DVC with status `grantedWithMods` may be produced. A DVC with status `granted` MUST only be produced if all signatures verified successfully. The field MUST be present, and the status must be set to WAITING, if no final response can be immediately available. It is assumed that the DVCS provides an additional final status some time later. The details of the necessary procedures are part of the DVCS policy. In case of failure, the requester can further investigate the cause of the failure, by looking into the TargetEtcChain fields. 'CertEtctoken.pkistatus' fields will indicate which item(s) has failed or succeeded the validation and for what reason. - The 'DVCSCertInfo.policy' field indicates the policy under which the DVCS operates. - If present, 'DVCSCertInfo.reqSignature' MUST be the same value as the signerInfos field of the corresponding request. It is a policy decision whether to include this field. - The 'DVCSCertInfo.certs' field contains the results of the verifications made by the DVCS. For the cpkc service, each element contains a copy of a corresponding field of the request with the selected subset the targetAndChain subfield and the results of the verifications, and additional certificates or certificate references, e.g., from certification authorities or as described in appendix C.3. For a vsd service, each element contains the result of the validation of one signature of the signed document to be validated. In case of a global status of WAITING, the DVCS MAY choose to return an invidual status of waiting in some of the 'certs' field, or not to return such a TargetEtcChain at all. The 'acceptablePolicySet' sequence indicate the policies and mappings that were processed during X.509 public key certificate path validation. PolicyMappingsSyntax is defined in [RFC2459]. - The 'extensions' field MAY be used to return additional information to the client. Extensions MAY be marked critical or not in order to indicate whether the client MUST understand them. This document Adams, Sylvester, Zolotarev, Zuccherato [Page 19] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 does not define extensions. 9.2. DVCS Error Notification A DVCS Error Notification is a CMS signedData object containing a DVCSResponse with a 'dvErrorNote' choice. DVCSErrorNotice ::= SEQUENCE { transactionStatus PKIStatusInfo , transactionIdentifier GeneralName OPTIONAL } The PKIStatusInfo is defined in the [RFC2511]. For the purposes of communicating the DVCSErrorNotice, the following subset of PKIFailureInfo values is used: PKIFailureInfo ::= BITSTRING { badRequest (2), -- transaction not permitted or supported badTime (3), -- messageTime was not sufficiently close to the system time, -- as defined by local policy badDataFormat (5), -- the data submitted has the wrong format wrongAuthority (6), -- the DVCS indicated in the request is different from the -- one creating the response token incorrectData (7) --the requester's data (i.e. signature) is incorrect ) In the DVCSErrorNotice, the PKIStatus field of the PKIStatusInfo must be set to REJECTED. The 'statusString' field of PKIStatusInfo can be used to accommodate extra text, such as a reason for the failure, for example "I have gone out of service". The DVCS initialises the 'DVCSErrorNotice.transactionIdentifier' with a copy of the 'DVCSRequest.transactionIdentifier' field of the corresponding request. In certain circumstances, a DVCS may not be able to produce a valid response to a request (for example, if it is unable to compute signatures for a period of time). In these situations the DVCS MAY create a response with an DVCSErrorNotice but no signature. DVCS clients SHOULD NOT trust unsigned responses. A DVCS client MAY trust unsigned responses, if the communication channel provides for Adams, Sylvester, Zolotarev, Zuccherato [Page 20] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 server authentication (e.g. by services defined by TLS [RFC2246]). 10. Transports There is no mandatory transport mechanism in this document. All mechanisms are optional. Two examples of transport protocols are given which allow online exchange of request and a response, and asymchronous communication between a client and a DVCS. A DVCS MAY use a combination of protocol, for exmaple in order to return additional DVCs. 10.1 DVCS Protocol via HTTP or HTTPS This subsection specifies a means for conveying ASN.1-encoded messages for the DVCS protocol exchanges via the HyperText Transfer Protocol. The DER encoded DVCS requests and responses are encapsulated using a simple MIME object with Content-Type application/dvcs (and with the default binary encoding). This MIME object can be sent and received using common HTTP or HTTPS processing engines over WWW links and provides a simple client-server transport for DVCS messages. 10.2 DVCS Protocol Using Email This section specifies a means for conveying ASN.1-encoded messages for the protocol exchanges described in Section 4 via Internet mail. The DER encoded DVCS requests and responses are encapsulated using a simple MIME object with Content-Type application/dvcs with an appropriate Content-Transfer-Encoding. This MIME object can be sent and received using MIME processing engines and provides a simple Internet mail transport for DVCS messages. In order to be able to associate a possible error response to a request, the requester SHOULD use the field 'transactionIdentifier'. The requester SHOULD not make any assumption about the usage of message header fields by the responding service, in particular the usage of fields like Subject, Message-ID or References. Adams, Sylvester, Zolotarev, Zuccherato [Page 21] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 11. Security Considerations This entire chapter discusses security considerations. When designing a data validation and certification service, the following considerations have been identified that have an impact upon the validity or "trust" in the data validation certificate. It is imperative that keys used to sign DVCs are guarded with proper security and controls in order to minimize the possibility of compromise. Nevertheless, in case the private key does become compromised, an audit trail of all the DVC generated by the DVCS SHOULD be kept as a means to help discriminate between genuine and false DVCs. A DVCS MAY provide for an vsd service to validate DVCs created by this DVCS or another one solely based on the audit trail. When confidentiality and server authentication is required, requests and responses MAY be protected using appropriate mechanisms (e.g. CMS encapsulation [RFC 2630] or TLS [RFC2246]). Server authentication is highly recommended for the vsd and cpd service. Client identification and authentication MAY use services defined by TLS [RFC2246]) instead of, or in addition to, using a CMS format providing authentication. 12. Patent Information The following United States Patents related to data validation and certification services, listed in chronological order, are known by the authors to exist at this time. This may not be an exhaustive list. Other patents may exist or be issued at any time. Implementers of the DVCS protocol and applications using the protocol SHOULD perform their own patent search and determine whether or not any encumberences exist on their implementation. # 4,309,569 Method of Providing Digital Signatures (issued) January 5, 1982 (inventor) Ralph C. Merkle (assignee) The Board of Trustees of the Leland Stanford Junior University # 5,001,752 Public/Key Date-Time Notary Facility (issued) March 19, 1991 (inventor) Addison M. Fischer # 5,022,080 Electronic Notary Adams, Sylvester, Zolotarev, Zuccherato [Page 22] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 (issued) June 4, 1991 (inventors) Robert T. Durst, Kevin D. Hunter # 5,136,643 Public/Key Date-Time Notary Facility (issued) August 4, 1992 (inventor) Addison M. Fischer (Note: This is a continuation of patent # 5,001,752.) # 5,136,646 Digital Document Time-Stamping with Catenate Certificate (issued) August 4, 1992 (inventors) Stuart A. Haber, Wakefield S. Stornetta Jr. (assignee) Bell Communications Research, Inc., # 5,136,647 Method for Secure Time-Stamping of Digital Documents (issued) August 4, 1992 (inventors) Stuart A. Haber, Wakefield S. Stornetta Jr. (assignee) Bell Communications Research, Inc., # 5,373,561 Method of Extending the Validity of a Cryptographic Certificate (issued) December 13, 1994 (inventors) Stuart A. Haber, Wakefield S. Stornetta Jr. (assignee) Bell Communications Research, Inc., # 5,422,95 Personal Date/Time Notary Device (issued) June 6, 1995 (inventor) Addison M. Fischer # 5,781,629 Digital Document Authentication System (issued) July 14, 1998 (inventor) Stuart A. Haber, Wakefield S. Stornetta Jr. (assignee) Surety Technologies, Inc., 10. References [RFC2119] "Key words for use in RFCs to Indicate Requirement Levels", RFC 2119. [RFC2510] C. Adams, S. Farrell, "Internet X.509 Public Key Infrastructure, Certificate Management Protocols," RFC-2510, 1999. [RFC2459] R. Housley, W. Ford, W. Polk, D. Solo, "Internet X.509 Public Key Infrastructure, Certificate and CRL Profile", RFC-2459. January 1999. [RFC2630] R. Housley, "Cryptographic Message Syntax", RFC-2630, June 1999. Adams, Sylvester, Zolotarev, Zuccherato [Page 23] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 [ISONR] ISO/IEC 10181-5: Security Frameworks in Open Systems. Non- Repudiation Framework. [RFC2119] Key works for use in RFCs to Indicate Requirement Levels, S. Bradner, RFC 2119, March 1997. [RFC2511] M. Myers, C. Adams, D. Solo, D. Kemp "Internet X.509 Certificate Request Message Format," RFC-2511, March 1999. [RFC2246] T. Dierks, C. Allen, "The TLS Protocol, Version 1.0," RFC 2246, January 1999. [RFC2634] P. Hoffman, "Enhanced Security Services for S/MIME", RFC 2634, June 1999 [RFC2560] M. Myers, R. Ankney, A. Malpani, S. Galperin, C. Adams, "X.509 Internet Public Key Infrastructure Online Certificate Status Protocol", RFC 2560, June 1999. 11. Authors' Addresses Carlisle Adams Peter Sylvester Entrust Technologies EdelWeb SA - Groupe ON-X Consulting 750 Heron Road 15, Quai Dion Bouton Ottawa, Ontario F-92816 Puteaux Cedex K1V 1A7 FRANCE CANADA peter.sylvester@edelweb.fr cadams@entrust.com Robert Zuccherato Michael Zolotarev Entrust Technologies Baltimore Technologies Pty Limited 750 Heron Road 5th Floor, 1 James Place Ottawa, Ontario North Sydney, NSW 2060 K1V 1A7 AUSTRALIA CANADA mzolotarev@baltimore.com robert.zuccherato@entrust.com APPENDIX A - PKCS #9 Attribute We define a PKCS #9 [PKCS9] attribute type. The attribute type has ASN.1 type SignedData and contains a data validation certificate. The object identifier id-aa-dvcs-dvc identifies the data valication certificate attribute type. id-aa-dvcs-dvc OBJECT IDENTIFIER ::= { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) aa(2) 29 } The attribute may be used as a authenticated or unauthenticated Adams, Sylvester, Zolotarev, Zuccherato [Page 24] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 attribute in CMS SignedData documents. APPENDIX B - Signed document validation. We present some examples of a possible use of DVCS in the context of validation of signed documents. B.1 Signed document validation The example covers the case where a DVCS is used by a signer to obtain a proof that a document's structure, including one or more attached signatures, is/was correct, after the document was signed. The DVC can be produced either by a DVCS that is trusted by the signer, or by a DVCS that is trusted by an intended verifier of the document. The signer uses the obtained DVC as an evidence that its intentions were good and it produced a signed document using the environment(keys, algorithms, etc) that was known to be OK. It produces a stand-alone document that can be used to extend the life of a signature. This example assumes that we have total trust in the Data Validation and Certification Server. Signature algorithms and keys have a finite lifetime. Therefore, signatures have a finite lifetime. The Data Certification Server can be used to extend the lifetime of a signature. In order to extend the lifetime of a signature in this way, the following technique can be used: 1) The signature needs to be certified: The signed message is presented to the Data Validation and Certification Server in a 'vsd' service request. The DVCS verifies that the signature and certificates are valid at that time by checking expiry dates, status information, or DVCs, and returns a DVC. 2) The DVC SHOULD be verified. The signature of the Data Validation and Certification Server in data certification token SHALL be verified using the Data Certification Server's valid verification key. Adams, Sylvester, Zolotarev, Zuccherato [Page 25] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 A signer's signing key (and therefore, its signature) is only valid until some specified time T1. The DVCS's signing key (and therefore, its signature) is valid until some specified time T2 that is (usually) after time T1. Without certification, the signer's signature would only be valid until time T1. With certification, the signer's signature remains valid until time T2, regardless of subsequent revocation or expiry at time T1. If the signature of the DVCS is valid, the trust we have in the DVCS allows us to conclude that the original signature on the data was valid at the time included in the DVC. The DVCS signing key MUST be of a sufficient length to allow for a sufficiently long lifetime. Even if this is done, the key will have a finite lifetime. Since data validation certificates are just another type of signed documents, they can be validated using (another) DVCS. APPENDIX C - Verifying the Status of a Public Key Certificate We now present three examples of how to produce a data validation certificate that can be used to assert that a public key certificate is valid, trusted, and can be used for a particular purpose. A client wants to use a given public key certificate either to use it to sign a document or to use it for document encryption. A DVCS MUST have access to current information regarding public certificate status, it can therefore be used to verify the revocation status of a certificate at the current time. The following technique can be used: A) The public key certificate needs to be validated. The certificate is presented to the Data Certification Server using a 'vpkc' service. The Data Validation and Certification Server verifies that the public key certificate is valid and that it hasn't been revoked and then returns a data validation certificate. B) The data validation certificate MUST be verified. The signature of the Data Certification Server in the data certification token SHALL be verified using the Data Validation and Certification Server's valid certificate. Adams, Sylvester, Zolotarev, Zuccherato [Page 26] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 C) The public key certificate is used: C.1) A clients's own public key certificate (i.e., the corresponding private key) can be used to add a signature to a document. The signing certificate and the data validation certificate can be added as signed attributes to the signature. A data validation certificate can now be used during the validation signatures using the key contained in the public key certificate. This service provided by the DVCS can be thought of as a supplement to the usual method of checking revocation status. In other words, signature validation at a later time does not necessarily require access to the revocation status of the user's signing certificate, access to a DVCS service and validation of the DVC is sufficient to verify a signature. Note that the DVC does not tell when the signature had been created, it only indicates when the signing certificate was valid. C.2) A public key certificate for key exchange can be used after having obtained a data validation certification certificate to encrypt data. The DVC can be stored with the data and/or stored by the creator of the encrypted document. If an intended recipient of the document claims that the creator did not use an appropriate encryption key, the DVC (obtained by a recipient's DVCS) can be used as evidence that the recipient's DVCS has authorized the usage of the public key. C.3) The procedure described in the previous paragraph can be enhanced to provide domain encryption in several ways. Organisations require that encrypted documents need to be recoverable. One simple way is to always encryt documents with additional recipients that acts as 'domain encryption centers' or 'recovery centers'. This is technically not a difficult problem, but may require complicated and difficult interactions with the end user, in particular when the document's recipients are in several different organisations. One possible solution consists of adding additional certificates to the dvc that validates the usage of a particular public key certificate used for encryption. In an environment of several organisation, one of the possible procedures may be: The client asks its local dvcs to validate the public key certificate. The dvcs forwards the request to a dvcs of a remote organisation. The remotes organisation's dvcs verifies Adams, Sylvester, Zolotarev, Zuccherato [Page 27] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 the certificate and provides a dvc assertion validating the certificate. It adds additional certificates usable for key exchange to the certEtcChain structure indication additional required recipients. The local dvc creates a dvc containing the dvc of the remote dvcs. It may add additional certificates or references to the dvc. The clients uses all validated certificates to be usable for key exchange to enhance its list of recipients. In the local dvcs may as well use local information about the remote organisation's need for additional recipients. Appendix D - MIME Registration To: ietf-types@iana.org Subject: Registration of MIME media type application/timestamp MIME media type name: application MIME subtype name: dvcs Required parameters: None Optional parameters: None Encoding considerations: binary or Base64 Security considerations: Carries a request for a data validation and certification service and the response. A request may be cryptographically signed. The response will be cryptographically signed. Interoperability considerations: None Published specification: IETF PKIX Working Group Draft on Data Validation and Certification Server Protocols Applications which use this media type: Data Validation and Certification Servers and Clients Additional information: Magic number(s): None File extension(s): .dvc Macintosh File Type Code(s): none Adams, Sylvester, Zolotarev, Zuccherato [Page 28] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 Person & email address to contact for further information: Peter Sylvester Intended usage: COMMON Author/Change controller: Peter Sylvester Appendix E - ASN.1 Module using 1988 Syntax PKIXDVCS {iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-dvcs(15)} DEFINITIONS IMPLICIT TAGS ::= BEGIN -- EXPORTS ALL -- IMPORTS Extensions, AlgorithmIdentifier FROM PKIX1Explicit88 {iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-pkix1-explicit-88(1)} GeneralName, PolicyInformation FROM PKIX1Implicit88 {iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-pkix1-implicit-88(2)} PKIStatusInfo, PKIStatusField FROM PKIXCMP {iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-cmp(9)} ContentInfo FROM CryptographicMessageSyntax {iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) modules(0) cms(1)} ESSCertID FROM ExtendedSecurityServices { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) modules(0) ess(2) } CertId, OCSPResponse, CertStatus FROM OCSP {iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-ocsp(14)} Adams, Sylvester, Zolotarev, Zuccherato [Page 29] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 SMIMECapabilities FROM SecureMimeMessageV3 { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) modules(0) smime(4) } ; -- Authority Information Access for DVCS id-ad-dvcs OBJECT IDENTIFIER ::= {id-pkix id-ad(48) 4} -- Key Purpose for DVCS id-kp-dvcs OBJECT IDENTIFIER ::= {id-pkix id-kp(3) 10} -- eContentType for a dvcs requests and responses id-ct-DVCSRequestData OBJECT IDENTIFIER ::= { id-smime ct(1) 7 } id-ct-DVCSResponseData OBJECT IDENTIFIER ::= { id-smime ct(1) 8 } -- Data validation certificate attribute id-aa-dvcs-dvc OBJECT IDENTIFIER ::= { id-smime aa(2) 29 } -- using the following bases : id-pkix OBJECT IDENTIFIER ::= {iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7)} id-smime OBJECT IDENTIFIER ::= { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9) 16 } Version ::= Integer DigestInfo ::= SEQUENCE { digestAlgorithm DigestAlgorithmIdentifier, digest Digest } Digest ::= OCTET STRING Nonce ::= Integer DVCSTime ::= CHOICE { genTime GeneralizedTime, timeStampToken ContentInfo } TargetEtcChain ::= SEQUENCE { Adams, Sylvester, Zolotarev, Zuccherato [Page 30] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 target CertEtcToken, chain SEQUENCE SIZE (1..MAX) OF CertEtcToken OPTIONAL, pathProcInput [0] PathProcInput OPTIONAL } PathProcInput ::= SEQUENCE { acceptablePolicySet SEQUENCE SIZE (1..MAX) OF PolicyInformation, inhibitPolicyMapping BOOLEAN DEFAULT FALSE, explicitPolicyReqd BOOLEAN DEFAULT FALSE } CertEtcToken ::= CHOICE { certificate [0] IMPLICIT Certificate , esscertid [1] ESSCertId , pkistatus [2] IMPLICIT PKIStatusInfo , assertion [3] ContentInfo , crl [4] IMPLICIT CertificateList, ocspcertstatus [5] IMPLICIT CertStatus, oscpcertid [6] IMPLICIT CertId , oscpresponse [7] IMPLICIT OCSPResponse, capabilities [8] SMIMECapabilities, extension Extension } DVCSRequestInformation ::= SEQUENCE { version INTEGER DEFAULT 1 , service ServiceType, nonce Nonce OPTIONAL, requestTime DVCSTime OPTIONAL, requester [0] GeneralNames OPTIONAL, requestPolicy [1] PolicyInformation OPTIONAL, dvcs [2] GeneralNames OPTIONAL, dataLocations [3] GeneralNames OPTIONAL, extensions [4] IMPLICIT Extensions OPTIONAL } ServiceType ::= ENUMERATED { cpd(1), vsd(2), cpkc(3), ccpd(4) } DVCSRequest ::= SEQUENCE { requestInformation DVCSRequestInformation, data Data, transactionIdentifier GeneralName OPTIONAL } Data ::= CHOICE { message OCTET STRING , Adams, Sylvester, Zolotarev, Zuccherato [Page 31] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 messageImprint DigestInfo, certs SEQUENCE SIZE (1..MAX) OF TargetEtcChain } DVCSResponse ::= CHOICE { dvCertInfo DVCSCertInfo , dvErrorNote [0] DVCSErrorNotice } DVCSCertInfo::= SEQUENCE { version Integer DEFAULT 1 , dvReqInfo DVCSRequestInformation, messageImprint DigestInfo, serialNumber Integer, responseTime DVCSTime, nonce Nonce OPTIONAL, dvStatus [0] PKIStatusInfo OPTIONAL, policy [1] PolicyInformation OPTIONAL, reqSignature [2] SignerInfos OPTIONAL, certs [3] SEQUENCE SIZE (1..MAX) OF TargetEtcChain OPTIONAL, extensions Extensions OPTIONAL } DVCSErrorNotice ::= SEQUENCE { transactionStatus PKIStatusInfo , transactionIdentifier GeneralName OPTIONAL } END Appendix F - Examples This chapter contains an example of a request and a response of a 'Certify Claim of Possession of Data' transaction of the Clepsydre Demonstration Project. The information has been formatted with Peter Gutmann's dumpasn1 program. The response Data Validation Certificate contains the signing certificate. The data that are time stamped is the binary of the client program used to make the request. Adams, Sylvester, Zolotarev, Zuccherato [Page 32] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 Request: 0 30 NDEF: SEQUENCE { 2 06 9: OBJECT IDENTIFIER signedData (1 2 840 113549 1 7 2) 13 A0 NDEF: [0] { 15 30 565: SEQUENCE { 19 02 1: INTEGER 3 22 31 11: SET { 24 30 9: SEQUENCE { 26 06 5: OBJECT IDENTIFIER sha1 (1 3 14 3 2 26) 33 05 0: NULL : } : } 35 30 NDEF: SEQUENCE { 37 06 11: OBJECT IDENTIFIER : id-ct-DVCSRequestData (1 2 840 113549 1 9 16 1 7) 50 A0 NDEF: [0] { 52 04 134: OCTET STRING, encapsulates { 55 30 131: SEQUENCE { 58 30 96: SEQUENCE { 60 0A 1: ENUMERATED CCPD (4) 63 A0 77: [0] { 65 A4 75: [4] { 67 30 73: SEQUENCE { 69 31 11: SET { 71 30 9: SEQUENCE { 73 06 3: OBJECT IDENTIFIER : countryName (2 5 4 6) 78 13 2: PrintableString 'FR' : } : } 82 31 14: SET { 84 30 12: SEQUENCE { 86 06 3: OBJECT IDENTIFIER : localityName (2 5 4 7) 91 13 5: PrintableString 'Paris' : } : } 98 31 16: SET { 100 30 14: SEQUENCE { 102 06 3: OBJECT IDENTIFIER : organizationName (2 5 4 10) 107 13 7: PrintableString 'EdelWeb' : } : } 116 31 24: SET { 118 30 22: SEQUENCE { 120 06 3: OBJECT IDENTIFIER Adams, Sylvester, Zolotarev, Zuccherato [Page 33] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 : commonName (2 5 4 3) 125 13 15: PrintableString 'Peter Sylvester' : } : } : } : } : } 142 A1 12: [1] { 144 06 10: OBJECT IDENTIFIER '1 3 6 1 4 1 5309 1 2 1' : } : } 156 30 31: SEQUENCE { 158 30 7: SEQUENCE { 160 06 5: OBJECT IDENTIFIER sha1 (1 3 14 3 2 26) : } 167 04 20: OCTET STRING : 75 B6 85 AF 6F 89 46 7D E8 07 15 25 1E 45 97 8F : CD 1F A5 66 : } : } : } : } : } 193 31 387: SET { 197 30 383: SEQUENCE { 201 02 1: INTEGER 1 204 30 124: SEQUENCE { 206 30 112: SEQUENCE { 208 31 11: SET { 210 30 9: SEQUENCE { 212 06 3: OBJECT IDENTIFIER countryName (2 5 4 6) 217 13 2: PrintableString 'FR' : } : } 221 31 21: SET { 223 30 19: SEQUENCE { 225 06 3: OBJECT IDENTIFIER organizationName (2 5 4 10) 230 13 12: PrintableString 'EdelWeb S.A.' : } : } 244 31 40: SET { 246 30 38: SEQUENCE { 248 06 3: OBJECT IDENTIFIER : organizationalUnitName (2 5 4 11) 253 13 31: PrintableString 'Clepsydre Demonstration Service' : } : } 286 31 32: SET { Adams, Sylvester, Zolotarev, Zuccherato [Page 34] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 288 30 30: SEQUENCE { 290 06 3: OBJECT IDENTIFIER commonName (2 5 4 3) 295 13 23: PrintableString 'Time Stamping Authority' : } : } : } 320 02 8: INTEGER : 00 94 88 17 21 34 37 76 : } 330 30 9: SEQUENCE { 332 06 5: OBJECT IDENTIFIER sha1 (1 3 14 3 2 26) 339 05 0: NULL : } 341 A0 95: [0] { 343 30 26: SEQUENCE { 345 06 9: OBJECT IDENTIFIER : contentType (1 2 840 113549 1 9 3) 356 31 13: SET { 358 06 11: OBJECT IDENTIFIER : id-ct-DVCSRequestData (1 2 840 113549 1 9 16 1 7) : } : } 371 30 28: SEQUENCE { 373 06 9: OBJECT IDENTIFIER : signingTime (1 2 840 113549 1 9 5) 384 31 15: SET { 386 17 13: UTCTime '000417171457Z' : } : } 401 30 35: SEQUENCE { 403 06 9: OBJECT IDENTIFIER : messageDigest (1 2 840 113549 1 9 4) 414 31 22: SET { 416 04 20: OCTET STRING : 4D A8 C2 D2 CE 7C 0D 04 41 2F 44 13 33 75 DB 2F : 5B 2D F9 DC : } : } : } 438 30 13: SEQUENCE { 440 06 9: OBJECT IDENTIFIER : rsaEncryption (1 2 840 113549 1 1 1) 451 05 0: NULL : } 453 04 128: OCTET STRING : 6E 7B 0E 36 F5 08 5F 16 3C 31 7B 28 BB 0B C2 C6 : 17 67 A6 B5 54 F1 98 E2 6F 89 96 0E 0C 99 E6 CB : 40 C1 9B 8D D8 D7 8E D3 2B 41 F7 16 26 5B B7 08 Adams, Sylvester, Zolotarev, Zuccherato [Page 35] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 : BF E6 95 B2 D9 01 6C FE B1 2C 52 C1 5A D2 31 F3 : 8E CA DD 11 A1 72 05 29 41 6A DD 28 40 AA 5C 77 : C6 9D 1D 80 53 DB 6F 9C 4C A5 A3 8F 92 8B 18 3F : D5 3A AD 01 87 69 C3 FD D3 D8 C3 D0 CA 6B E6 0D : 4E 53 6E 50 20 99 7C 94 C2 44 25 1B 06 C0 99 96 : } : } : } : } : } The corresponding data in PEM format are: -----BEGIN PKCS7----- MIAGCSqGSIb3DQEHAqCAMIICNQIBAzELMAkGBSsOAwIaBQAwgAYLKoZIhvcNAQkQ AQeggASBhjCBgzBgCgEEoE2kSzBJMQswCQYDVQQGEwJGUjEOMAwGA1UEBxMFUGFy aXMxEDAOBgNVBAoTB0VkZWxXZWIxGDAWBgNVBAMTD1BldGVyIFN5bHZlc3RlcqEM BgorBgEEAak9AQIBMB8wBwYFKw4DAhoEFHW2ha9viUZ96AcVJR5Fl4/NH6VmAAAA ADGCAYMwggF/AgEBMHwwcDELMAkGA1UEBhMCRlIxFTATBgNVBAoTDEVkZWxXZWIg Uy5BLjEoMCYGA1UECxMfQ2xlcHN5ZHJlIERlbW9uc3RyYXRpb24gU2VydmljZTEg MB4GA1UEAxMXVGltZSBTdGFtcGluZyBBdXRob3JpdHkCCACUiBchNDd2MAkGBSsO AwIaBQCgXzAaBgkqhkiG9w0BCQMxDQYLKoZIhvcNAQkQAQcwHAYJKoZIhvcNAQkF MQ8XDTAwMDQxNzE3MTQ1N1owIwYJKoZIhvcNAQkEMRYEFE2owtLOfA0EQS9EEzN1 2y9bLfncMA0GCSqGSIb3DQEBAQUABIGAbnsONvUIXxY8MXsouwvCxhdnprVU8Zji b4mWDgyZ5stAwZuN2NeO0ytB9xYmW7cIv+aVstkBbP6xLFLBWtIx847K3RGhcgUp QWrdKECqXHfGnR2AU9tvnEylo4+Sixg/1TqtAYdpw/3T2MPQymvmDU5TblAgmXyU wkQlGwbAmZYAAAAA -----END PKCS7----- Response: 0 30 NDEF: SEQUENCE { 2 06 9: OBJECT IDENTIFIER signedData (1 2 840 113549 1 7 2) 13 A0 NDEF: [0] { 15 30 2020: SEQUENCE { 19 02 1: INTEGER 3 22 31 11: SET { 24 30 9: SEQUENCE { 26 06 5: OBJECT IDENTIFIER sha1 (1 3 14 3 2 26) 33 05 0: NULL : } : } 35 30 NDEF: SEQUENCE { 37 06 11: OBJECT IDENTIFIER : id-ct-DVCSResponseData (1 2 840 113549 1 9 16 1 8) 50 A0 NDEF: [0] { 52 04 280: OCTET STRING, encapsulates { Adams, Sylvester, Zolotarev, Zuccherato [Page 36] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 56 30 276: SEQUENCE { 60 30 214: SEQUENCE { 63 0A 1: ENUMERATED CCPD (4) 66 A0 77: [0] { 68 A4 75: [4] { 70 30 73: SEQUENCE { 72 31 11: SET { 74 30 9: SEQUENCE { 76 06 3: OBJECT IDENTIFIER : countryName (2 5 4 6) 81 13 2: PrintableString 'FR' : } : } 85 31 14: SET { 87 30 12: SEQUENCE { 89 06 3: OBJECT IDENTIFIER : localityName (2 5 4 7) 94 13 5: PrintableString 'Paris' : } : } 101 31 16: SET { 103 30 14: SEQUENCE { 105 06 3: OBJECT IDENTIFIER : organizationName (2 5 4 10) 110 13 7: PrintableString 'EdelWeb' : } : } 119 31 24: SET { 121 30 22: SEQUENCE { 123 06 3: OBJECT IDENTIFIER : commonName (2 5 4 3) 128 13 15: PrintableString 'Peter Sylvester' : } : } : } : } : } 145 A1 12: [1] { 147 06 10: OBJECT IDENTIFIER '1 3 6 1 4 1 5309 1 2 1' : } 159 A2 116: [2] { 161 A4 114: [4] { 163 30 112: SEQUENCE { 165 31 11: SET { 167 30 9: SEQUENCE { 169 06 3: OBJECT IDENTIFIER : countryName (2 5 4 6) 174 13 2: PrintableString 'FR' Adams, Sylvester, Zolotarev, Zuccherato [Page 37] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 : } : } 178 31 21: SET { 180 30 19: SEQUENCE { 182 06 3: OBJECT IDENTIFIER : organizationName (2 5 4 10) 187 13 12: PrintableString 'EdelWeb S.A.' : } : } 201 31 40: SET { 203 30 38: SEQUENCE { 205 06 3: OBJECT IDENTIFIER : organizationalUnitName (2 5 4 11) 210 13 31: PrintableString 'Clepsydre Demonstration Service' : } : } 243 31 32: SET { 245 30 30: SEQUENCE { 247 06 3: OBJECT IDENTIFIER : commonName (2 5 4 3) 252 13 23: PrintableString 'Time Stamping Authority' : } : } : } : } : } : } 277 30 31: SEQUENCE { 279 30 7: SEQUENCE { 281 06 5: OBJECT IDENTIFIER sha1 (1 3 14 3 2 26) : } 288 04 20: OCTET STRING : 75 B6 85 AF 6F 89 46 7D E8 07 15 25 1E 45 97 8F : CD 1F A5 66 : } 310 02 7: INTEGER : 01 78 0A 1E CA 88 23 319 18 15: GeneralizedTime '20000417171617Z' : } : } : } : } 340 A0 992: [0] { 344 30 988: SEQUENCE { 348 30 708: SEQUENCE { 352 A0 3: [0] { 354 02 1: INTEGER 2 : } Adams, Sylvester, Zolotarev, Zuccherato [Page 38] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 357 02 8: INTEGER : 00 94 88 17 17 64 37 32 367 30 13: SEQUENCE { 369 06 9: OBJECT IDENTIFIER : md5withRSAEncryption (1 2 840 113549 1 1 4) 380 05 0: NULL : } 382 30 112: SEQUENCE { 384 31 11: SET { 386 30 9: SEQUENCE { 388 06 3: OBJECT IDENTIFIER countryName (2 5 4 6) 393 13 2: PrintableString 'FR' : } : } 397 31 21: SET { 399 30 19: SEQUENCE { 401 06 3: OBJECT IDENTIFIER organizationName (2 5 4 10) 406 13 12: PrintableString 'EdelWeb S.A.' : } : } 420 31 40: SET { 422 30 38: SEQUENCE { 424 06 3: OBJECT IDENTIFIER : organizationalUnitName (2 5 4 11) 429 13 31: PrintableString 'Clepsydre Demonstration Service' : } : } 462 31 32: SET { 464 30 30: SEQUENCE { 466 06 3: OBJECT IDENTIFIER commonName (2 5 4 3) 471 13 23: PrintableString 'Time Stamping Authority' : } : } : } 496 30 30: SEQUENCE { 498 17 13: UTCTime '000125161938Z' 513 17 13: UTCTime '200120161938Z' : } 528 30 112: SEQUENCE { 530 31 11: SET { 532 30 9: SEQUENCE { 534 06 3: OBJECT IDENTIFIER countryName (2 5 4 6) 539 13 2: PrintableString 'FR' : } : } 543 31 21: SET { 545 30 19: SEQUENCE { 547 06 3: OBJECT IDENTIFIER organizationName (2 5 4 10) Adams, Sylvester, Zolotarev, Zuccherato [Page 39] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 552 13 12: PrintableString 'EdelWeb S.A.' : } : } 566 31 40: SET { 568 30 38: SEQUENCE { 570 06 3: OBJECT IDENTIFIER : organizationalUnitName (2 5 4 11) 575 13 31: PrintableString 'Clepsydre Demonstration Service' : } : } 608 31 32: SET { 610 30 30: SEQUENCE { 612 06 3: OBJECT IDENTIFIER commonName (2 5 4 3) 617 13 23: PrintableString 'Time Stamping Authority' : } : } : } 642 30 290: SEQUENCE { 646 30 13: SEQUENCE { 648 06 9: OBJECT IDENTIFIER : rsaEncryption (1 2 840 113549 1 1 1) 659 05 0: NULL : } 661 03 271: BIT STRING 0 unused bits : 30 82 01 0A 02 82 01 01 00 FA C3 17 AE EB B7 9D : EB AB BD 05 7E 39 43 6D 04 45 58 74 05 A5 CC F3 : 6C 2F 8C 8E 77 7E C2 9F 12 11 5C 7D DB BE 23 28 : 9A 90 D2 AB C6 A2 BA BD A3 7E 99 A6 99 21 A5 D8 : 90 B9 CF A7 23 4E A0 56 A0 C1 0A 46 89 8E 3C 91 : 67 37 FD 9B AB 49 17 FC 4A A5 F2 E4 4C 6E E3 6A : 1C 92 97 04 6F 7F 0C 5C FB 74 CB 95 7E 4C C3 58 : 12 E8 A9 D6 F0 DD 12 44 15 E7 8B 2E AF 51 C0 0C : [ Another 142 bytes skipped ] : } 936 A3 122: [3] { 938 30 120: SEQUENCE { 940 30 15: SEQUENCE { 942 06 3: OBJECT IDENTIFIER basicConstraints (2 5 29 19) 947 04 8: OCTET STRING, encapsulates { 949 30 6: SEQUENCE { 951 01 1: BOOLEAN TRUE 954 02 1: INTEGER 0 : } : } : } 957 30 22: SEQUENCE { 959 06 3: OBJECT IDENTIFIER extKeyUsage (2 5 29 37) 964 01 1: BOOLEAN TRUE Adams, Sylvester, Zolotarev, Zuccherato [Page 40] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 967 04 12: OCTET STRING, encapsulates { 969 30 10: SEQUENCE { 971 06 8: OBJECT IDENTIFIER '1 3 6 1 5 5 7 3 10' : } : } : } 981 30 77: SEQUENCE { 983 06 8: OBJECT IDENTIFIER : authorityInfoAccess (1 3 6 1 5 5 7 1 1) 993 01 1: BOOLEAN TRUE 996 04 62: OCTET STRING, encapsulates { 998 30 60: SEQUENCE { 1000 30 58: SEQUENCE { 1002 06 8: OBJECT IDENTIFIER '1 3 6 1 5 5 7 48 4' 1012 86 46: [6] : 'https://clepsydre.edelweb.fr/dvcs/service-ccpd' : } : } : } : } : } : } : } 1060 30 13: SEQUENCE { 1062 06 9: OBJECT IDENTIFIER : md5withRSAEncryption (1 2 840 113549 1 1 4) 1073 05 0: NULL : } 1075 03 257: BIT STRING 0 unused bits : 08 DA AF 5B 09 39 66 D3 BE 80 1D D7 72 B5 2C A3 : 04 FB 46 F8 05 F5 BF 83 F3 6D 6D 32 28 1C 46 EE : 0F EA 30 61 8A 1E 8A 03 4E 98 81 60 1F 97 17 53 : D1 54 73 3F 72 98 45 D3 10 9A D3 77 B8 74 0E 9A : 90 29 8E AC A4 EB D2 24 6D F6 21 1D 3F 52 8B 2C : E6 92 E7 52 C6 54 93 91 BC 57 74 21 38 39 75 CD : 30 49 54 13 94 6C FE F1 64 38 1F 5F 7D BB E0 3E : A8 F1 28 1C F1 D9 28 FA 32 1E 3B 48 BF 5C 70 21 : [ Another 128 bytes skipped ] : } : } 1336 31 699: SET { 1340 30 695: SEQUENCE { 1344 02 1: INTEGER 1 1347 30 124: SEQUENCE { 1349 30 112: SEQUENCE { 1351 31 11: SET { 1353 30 9: SEQUENCE { 1355 06 3: OBJECT IDENTIFIER countryName (2 5 4 6) Adams, Sylvester, Zolotarev, Zuccherato [Page 41] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 1360 13 2: PrintableString 'FR' : } : } 1364 31 21: SET { 1366 30 19: SEQUENCE { 1368 06 3: OBJECT IDENTIFIER organizationName (2 5 4 10) 1373 13 12: PrintableString 'EdelWeb S.A.' : } : } 1387 31 40: SET { 1389 30 38: SEQUENCE { 1391 06 3: OBJECT IDENTIFIER : organizationalUnitName (2 5 4 11) 1396 13 31: PrintableString 'Clepsydre Demonstration Service' : } : } 1429 31 32: SET { 1431 30 30: SEQUENCE { 1433 06 3: OBJECT IDENTIFIER commonName (2 5 4 3) 1438 13 23: PrintableString 'Time Stamping Authority' : } : } : } 1463 02 8: INTEGER : 00 94 88 25 72 35 27 50 : } 1473 30 9: SEQUENCE { 1475 06 5: OBJECT IDENTIFIER sha1 (1 3 14 3 2 26) 1482 05 0: NULL : } 1484 A0 276: [0] { 1488 30 26: SEQUENCE { 1490 06 9: OBJECT IDENTIFIER : contentType (1 2 840 113549 1 9 3) 1501 31 13: SET { 1503 06 11: OBJECT IDENTIFIER : id-ct-DVCSResponseData (1 2 840 113549 1 9 16 1 8) : } : } 1516 30 28: SEQUENCE { 1518 06 9: OBJECT IDENTIFIER : signingTime (1 2 840 113549 1 9 5) 1529 31 15: SET { 1531 17 13: UTCTime '000417171619Z' : } : } 1546 30 35: SEQUENCE { 1548 06 9: OBJECT IDENTIFIER Adams, Sylvester, Zolotarev, Zuccherato [Page 42] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 : messageDigest (1 2 840 113549 1 9 4) 1559 31 22: SET { 1561 04 20: OCTET STRING : 68 50 DC 90 20 2E C2 F0 55 15 7F 77 A9 A6 0C 34 : CC 13 06 FA : } : } 1583 30 178: SEQUENCE { 1586 06 11: OBJECT IDENTIFIER : id-aa-signingCertificate (1 2 840 113549 1 9 16 2 12) 1599 31 162: SET { 1602 30 159: SEQUENCE { 1605 30 156: SEQUENCE { 1608 30 153: SEQUENCE { 1611 04 20: OCTET STRING : 5C F1 18 F3 4A CA B4 67 D6 D8 E7 F8 3B 4A D9 7A : 32 A5 43 A5 1633 30 128: SEQUENCE { 1636 30 116: SEQUENCE { 1638 A4 114: [4] { 1640 30 112: SEQUENCE { 1642 31 11: SET { 1644 30 9: SEQUENCE { 1646 06 3: OBJECT IDENTIFIER : countryName (2 5 4 6) 1651 13 2: PrintableString 'FR' : } : } 1655 31 21: SET { 1657 30 19: SEQUENCE { 1659 06 3: OBJECT IDENTIFIER : organizationName (2 5 4 10) 1664 13 12: PrintableString 'EdelWeb S.A.' : } : } 1678 31 40: SET { 1680 30 38: SEQUENCE { 1682 06 3: OBJECT IDENTIFIER : organizationalUnitName (2 5 4 11) 1687 13 31: PrintableString 'Clepsydre Demonstration Service' : } : } 1720 31 32: SET { 1722 30 30: SEQUENCE { 1724 06 3: OBJECT IDENTIFIER : commonName (2 5 4 3) 1729 13 23: PrintableString 'Time Stamping Authority' : } Adams, Sylvester, Zolotarev, Zuccherato [Page 43] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 : } : } : } : } 1754 02 8: INTEGER : 00 94 88 25 72 35 27 50 : } : } : } : } : } : } : } 1764 30 13: SEQUENCE { 1766 06 9: OBJECT IDENTIFIER : rsaEncryption (1 2 840 113549 1 1 1) 1777 05 0: NULL : } 1779 04 256: OCTET STRING : 2E 70 9F 56 5E 01 56 A9 E1 47 81 12 35 21 29 09 : 16 7A ED 45 F9 5A A2 ED E4 FE 9D 2C E4 DA 12 66 : 62 14 59 61 8B 50 7B 01 82 3D BD 7E E6 38 D0 A8 : A0 37 98 79 13 26 39 29 C6 72 20 A9 95 71 E7 53 : 7F 79 77 98 EF 23 02 4E B9 BD 90 9B AC 05 A2 70 : 8F 3A 42 36 9C 2C B0 94 B1 2B 0B 36 94 0E 78 0E : B0 D1 09 20 63 BC FF CD 32 F1 5A D3 AB 9F 93 9C : 5A A3 58 99 A0 28 11 E0 80 4D 4D 1E 77 04 F4 50 : [ Another 128 bytes skipped ] : } : } : } : } : } The corresponding data in PEM format (together with a technical textual description) are: Data Validation Certificate: Request Information: Service: Certify Claim of Possession of Data - ccpd(4) Policy: EdelWeb Customer Policy Clepsydre Requester: DirName:/C=FR/L=Paris/O=EdelWeb/CN=Peter Sylvester DVCS: DirName:/C=FR/O=EdelWeb S.A./ OU=Clepsydre Demonstration Service/CN=Time Stamping Authority SerialNumber: 01780a1eca8823 Adams, Sylvester, Zolotarev, Zuccherato [Page 44] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 MessageDigest: Algorithm: sha1 Data : 75B685AF6F89467DE80715251E45978FCD1FA566 Asserted Time: Generalized Time: 17-Apr-2000 19:16:17 (Apr 17 17:16:17 2000 GMT) Certificate: Data: Version: 3 (0x2) Serial Number: 94:88:17:17:64:37:32 Signature Algorithm: md5WithRSAEncryption Issuer: C=FR, O=EdelWeb S.A., OU=Clepsydre Demonstration Service, CN=Time Stamping Authority Validity Not Before: Jan 25 16:19:38 2000 GMT Not After : Jan 20 16:19:38 2020 GMT Subject: C=FR, O=EdelWeb S.A., OU=Clepsydre Demonstration Service, CN=Time Stamping Authority Subject Public Key Info: Public Key Algorithm: rsaEncryption RSA Public Key: (2048 bit) Modulus (2048 bit): 00:fa:c3:17:ae:eb:b7:9d:eb:ab:bd:05:7e:39:43: 6d:04:45:58:74:05:a5:cc:f3:6c:2f:8c:8e:77:7e: c2:9f:12:11:5c:7d:db:be:23:28:9a:90:d2:ab:c6: a2:ba:bd:a3:7e:99:a6:99:21:a5:d8:90:b9:cf:a7: 23:4e:a0:56:a0:c1:0a:46:89:8e:3c:91:67:37:fd: 9b:ab:49:17:fc:4a:a5:f2:e4:4c:6e:e3:6a:1c:92: 97:04:6f:7f:0c:5c:fb:74:cb:95:7e:4c:c3:58:12: e8:a9:d6:f0:dd:12:44:15:e7:8b:2e:af:51:c0:0c: 5f:a8:65:fc:47:a1:c9:98:1f:d4:e1:ea:bc:1c:1a: 27:bb:8b:56:f1:12:55:10:f4:8e:d8:9f:19:9c:1e: 81:f7:db:63:dd:88:37:3f:71:79:5b:96:e2:5f:82: d5:12:19:05:0d:e1:3d:a5:6d:66:e4:2c:1e:ed:c7: 4c:b8:df:aa:38:c8:15:6a:ae:25:7d:46:2a:07:f9: 83:77:c4:51:ee:90:dc:05:d0:c3:f0:f1:5f:e8:d4: ed:5d:34:70:91:9d:9f:08:55:7d:5b:e5:8d:5f:35: 59:83:4e:72:19:bb:9c:88:d1:7a:fc:23:a5:84:99: b4:17:8a:4d:6c:9d:d0:a6:35:80:5f:ca:fb:24:8b: 54:1d Exponent: 65537 (0x10001) X509v3 extensions: X509v3 Basic Constraints: CA:TRUE, pathlen:0 X509v3 Extended Key Usage: critical DVCS Signing Authority Information Access: critical DVCS - URI:https://clepsydre.edelweb.fr/dvcs/service-ccpd Adams, Sylvester, Zolotarev, Zuccherato [Page 45] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 Signature Algorithm: md5WithRSAEncryption 08:da:af:5b:09:39:66:d3:be:80:1d:d7:72:b5:2c:a3:04:fb: 46:f8:05:f5:bf:83:f3:6d:6d:32:28:1c:46:ee:0f:ea:30:61: 8a:1e:8a:03:4e:98:81:60:1f:97:17:53:d1:54:73:3f:72:98: 45:d3:10:9a:d3:77:b8:74:0e:9a:90:29:8e:ac:a4:eb:d2:24: 6d:f6:21:1d:3f:52:8b:2c:e6:92:e7:52:c6:54:93:91:bc:57: 74:21:38:39:75:cd:30:49:54:13:94:6c:fe:f1:64:38:1f:5f: 7d:bb:e0:3e:a8:f1:28:1c:f1:d9:28:fa:32:1e:3b:48:bf:5c: 70:21:29:ef:be:72:24:da:0d:f9:51:7a:fe:d7:f5:ff:e8:c2: ea:c6:4c:45:14:51:53:fd:00:d5:5b:cc:67:2a:23:94:31:9e: c2:90:38:9b:b0:df:f9:de:67:0c:57:5c:d7:b0:fc:f2:72:96: c4:d1:7a:9d:a0:e6:51:24:99:9e:89:c6:39:f9:72:7a:44:fd: 2d:3f:bc:df:c7:25:27:94:a1:b5:7d:ba:06:75:67:1c:95:6c: bd:2c:74:41:3e:cd:cd:39:5c:2e:9c:c3:c3:09:e3:79:d5:eb: 85:e8:f1:72:29:80:f6:c6:6e:61:1b:58:fc:87:3e:d9:e1:53: 10:e0:b1:05 -----BEGIN PKCS7----- MIAGCSqGSIb3DQEHAqCAMIIH5AIBAzELMAkGBSsOAwIaBQAwgAYLKoZIhvcNAQkQ AQiggASCARgwggEUMIHWCgEEoE2kSzBJMQswCQYDVQQGEwJGUjEOMAwGA1UEBxMF UGFyaXMxEDAOBgNVBAoTB0VkZWxXZWIxGDAWBgNVBAMTD1BldGVyIFN5bHZlc3Rl cqEMBgorBgEEAak9AQIBonSkcjBwMQswCQYDVQQGEwJGUjEVMBMGA1UEChMMRWRl bFdlYiBTLkEuMSgwJgYDVQQLEx9DbGVwc3lkcmUgRGVtb25zdHJhdGlvbiBTZXJ2 aWNlMSAwHgYDVQQDExdUaW1lIFN0YW1waW5nIEF1dGhvcml0eTAfMAcGBSsOAwIa BBR1toWvb4lGfegHFSUeRZePzR+lZgIHAXgKHsqIIxgPMjAwMDA0MTcxNzE2MTda AAAAAKCCA+AwggPcMIICxKADAgECAggAlIgXF2Q3MjANBgkqhkiG9w0BAQQFADBw MQswCQYDVQQGEwJGUjEVMBMGA1UEChMMRWRlbFdlYiBTLkEuMSgwJgYDVQQLEx9D bGVwc3lkcmUgRGVtb25zdHJhdGlvbiBTZXJ2aWNlMSAwHgYDVQQDExdUaW1lIFN0 YW1waW5nIEF1dGhvcml0eTAeFw0wMDAxMjUxNjE5MzhaFw0yMDAxMjAxNjE5Mzha MHAxCzAJBgNVBAYTAkZSMRUwEwYDVQQKEwxFZGVsV2ViIFMuQS4xKDAmBgNVBAsT H0NsZXBzeWRyZSBEZW1vbnN0cmF0aW9uIFNlcnZpY2UxIDAeBgNVBAMTF1RpbWUg U3RhbXBpbmcgQXV0aG9yaXR5MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEA+sMXruu3neurvQV+OUNtBEVYdAWlzPNsL4yOd37CnxIRXH3bviMompDSq8ai ur2jfpmmmSGl2JC5z6cjTqBWoMEKRomOPJFnN/2bq0kX/Eql8uRMbuNqHJKXBG9/ DFz7dMuVfkzDWBLoqdbw3RJEFeeLLq9RwAxfqGX8R6HJmB/U4eq8HBonu4tW8RJV EPSO2J8ZnB6B99tj3Yg3P3F5W5biX4LVEhkFDeE9pW1m5Cwe7cdMuN+qOMgVaq4l fUYqB/mDd8RR7pDcBdDD8PFf6NTtXTRwkZ2fCFV9W+WNXzVZg05yGbuciNF6/COl hJm0F4pNbJ3QpjWAX8r7JItUHQIDAQABo3oweDAPBgNVHRMECDAGAQH/AgEAMBYG A1UdJQEB/wQMMAoGCCsGAQUFBwMKME0GCCsGAQUFBwEBAQH/BD4wPDA6BggrBgEF BQcwBIYuaHR0cHM6Ly9jbGVwc3lkcmUuZWRlbHdlYi5mci9kdmNzL3NlcnZpY2Ut Y2NwZDANBgkqhkiG9w0BAQQFAAOCAQEACNqvWwk5ZtO+gB3XcrUsowT7RvgF9b+D 821tMigcRu4P6jBhih6KA06YgWAflxdT0VRzP3KYRdMQmtN3uHQOmpApjqyk69Ik bfYhHT9SiyzmkudSxlSTkbxXdCE4OXXNMElUE5Rs/vFkOB9ffbvgPqjxKBzx2Sj6 Mh47SL9ccCEp775yJNoN+VF6/tf1/+jC6sZMRRRRU/0A1VvMZyojlDGewpA4m7Df +d5nDFdc17D88nKWxNF6naDmUSSZnonGOflyekT9LT+838clJ5ShtX26BnVnHJVs vSx0QT7NzTlcLpzDwwnjedXrhejxcimA9sZuYRtY/Ic+2eFTEOCxBTGCArswggK3 AgEBMHwwcDELMAkGA1UEBhMCRlIxFTATBgNVBAoTDEVkZWxXZWIgUy5BLjEoMCYG A1UECxMfQ2xlcHN5ZHJlIERlbW9uc3RyYXRpb24gU2VydmljZTEgMB4GA1UEAxMX Adams, Sylvester, Zolotarev, Zuccherato [Page 46] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 VGltZSBTdGFtcGluZyBBdXRob3JpdHkCCACUiCVyNSdQMAkGBSsOAwIaBQCgggEU MBoGCSqGSIb3DQEJAzENBgsqhkiG9w0BCRABCDAcBgkqhkiG9w0BCQUxDxcNMDAw NDE3MTcxNjE5WjAjBgkqhkiG9w0BCQQxFgQUaFDckCAuwvBVFX93qaYMNMwTBvow gbIGCyqGSIb3DQEJEAIMMYGiMIGfMIGcMIGZBBRc8RjzSsq0Z9bY5/g7Stl6MqVD pTCBgDB0pHIwcDELMAkGA1UEBhMCRlIxFTATBgNVBAoTDEVkZWxXZWIgUy5BLjEo MCYGA1UECxMfQ2xlcHN5ZHJlIERlbW9uc3RyYXRpb24gU2VydmljZTEgMB4GA1UE AxMXVGltZSBTdGFtcGluZyBBdXRob3JpdHkCCACUiCVyNSdQMA0GCSqGSIb3DQEB AQUABIIBAC5wn1ZeAVap4UeBEjUhKQkWeu1F+Vqi7eT+nSzk2hJmYhRZYYtQewGC Pb1+5jjQqKA3mHkTJjkpxnIgqZVx51N/eXeY7yMCTrm9kJusBaJwjzpCNpwssJSx Kws2lA54DrDRCSBjvP/NMvFa06ufk5xao1iZoCgR4IBNTR53BPRQB9WLVKAjMv+m nOK6uNtVR8nIugfvkBRIqLbFfNWpIHQcVu+PG7P8h22B8dRvGocwkkdp4HngvBCZ z002TDYDUXLRW6YeLYbxHwrov+s4+c4a7LCPUa4qO0aEv02Mn+4f78U1o2O+OMAD fDpeuM87GBCI27tPePb75ByN1Pj761AAAAAA -----END PKCS7----- Appendix G - Acknowledgements This document is based on two initial works from Robert Zuccherato and Carlisle Adams, both at Entrust Technologies, for time stamping and for notary and data certification services. Thanks to Denis Pinkas, Bull and Bruno Salgueiro, SIBS for valuable comments. Appendix G - Full Copyright Statement Copyright (C) The Internet Society 1999. All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process shall be followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS Adams, Sylvester, Zolotarev, Zuccherato [Page 47] draft-ietf-pkix-dcs-07.txt DVCS Protocols October 5, 2000 IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. This document expires expires April 5, 2001. Adams, Sylvester, Zolotarev, Zuccherato [Page 48]