An Anonymous Authentication Scheme with Selective Linkability and Threshold Traceability

In order to protect the user's privacy identity, authentication requires anonymous authentication. Anonymous is divided into unconditional and traceable Unconditional can verify that user belongs an set, but true identity cannot be obtained. However, in some applications, it necessary trace of user. Therefore, a scheme proposed. prevent random tracing, proposed uses threshold joint tracing. When authenticator needs traced, number members jointly authenticator. special network applications such as electronic voting, repeated authentications elections, whether two signatures are signed by same without revealing should have selective linkability. achieve linkable authentication, tag embedded ring signature. Compared with similar schemes through simulation experiments, implementation time slightly better than other schemes.