20009-2

1 Scope This part of ISO/IEC 20009 specifies anonymous entity authentication mechanisms based on signatures using a group public key in which a verifier verifies a group signature scheme to authenticate the entity with which it is communicating, without knowing this entity’s identity. This part of ISO/IEC 20009 provides — a general description of an anonymous entity authentication mechanism based on signatures using a group public key; — a variety of mechanisms of this type. This part of ISO/IEC 20009 describes — the group membership issuing processes; — anonymous authentication mechanisms without an online Trusted Third Party (TTP); — anonymous authentication mechanisms involving an online TTP. Furthermore, this part of ISO/IEC 20009 also specifies — the group membership opening process (optional); — the group signature linking process (optional).