CCITT and ISO have been pursuing several joint security projects. Namely,
This committee has already produced Recommendations X.400-X.409, Message Handling Systems, that also address the security requirements of such systems (most notably X.400, MHS: System and Service Overview, and X.402, MHS: Overall Architecture, that correspond to ISO 10021-1 and to ISO 10021-2 respectively).
This group is working jointly with SC21 on the following projects:
This committee is currently preparing a Security Framework for Telematic Services.