A Traceable and Anonymous Authentication Ring Signature Scheme with Privacy Protection

Abstract

A traceable anonymous authentication ring signature scheme with privacy protection is proposed to solve the problem of tracking the identity of malicious signers in ring signatures and protecting the identity privacy of receiver. When the decrypted plaintext contains illegal words, the receiver can request to trusted third party (TTP) to trace the signer, the trusted third party (TTP) interaction with the ring member to find the signer. In avoid leaking the privacy information of receiver, and receiver’s privacy information or input data. Before identify tracing, scheme adopts zero-knowledge proof (ZKP) technology verify the legitimacy of receiver and protect the privacy of the receiver. At last, trusted third party (TTP) returns the public key of the traced signer to the receiver. Based on the computational Diffie-Hellman difficult problem, the scheme is proved to satisfy the security of signature unforgeability under the random oracle model. Compared with the existing schemes, the experimental results show that the scheme reduces the time of signature by 47.521%, the time of verification by 45.915%, and the time of traceability by 16.630%, which proves that the scheme is more effective.