Throughout this section, references have been made to MHS security management services, namely, the registration of security labels, and the registration of credentials. For completeness, these services are described in this section.
The registration of security labels service allows an MTS user to convey a set of security labels that are maintained by its MTA. The MTA uses these labels primarily to control the delivery of messages to the MTS user.
The registration of credentials service allows peer MHS entities (i.e., an MTS user and its MTA) to register credentials with each other. For simple authentication, credentials comprise the password associated with the entity. For strong authentication, credentials comprise the entity's public key certificate. These credentials are used primarily when the peer entities are establishing an association.