scope:

This part of ISO/IEC 20008 specifies anonymous digital signature mechanisms, in which a verifier makes use of a group public key to verify a digital signature. It provides - a general description of an anonymous digital signature mechanism using a group public key, and - a variety of mechanisms that provide such anonymous digital signatures. For each mechanism, this part of ISO/IEC 20008 specifies - the process for generating group member signature keys and a group public key, - the process for producing signatures, - the process for verifying signatures, - the process for opening signatures (if the mechanism supports opening), - the process for linking signatures (if the mechanism supports linking), and - the process for revoking group members.