Alcance
ISO/IEC 20009-2:2013 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.ISO/IEC 20009-2:2013 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.ISO/IEC 20009-2:2013 describes:the group membership issuing processes;anonymous authentication mechanisms without an online Trusted Third Party (TTP);anonymous authentication mechanisms involving an online TTP.Furthermore, ISO/IEC 20009-2:2013 also specifies:the group membership opening process (optional);the group signature linking process (optional).