Research on Proxy Ring Signature with Anonymity of the Original Signer

Ring signature is a new kind of anonymous signature which can provide unconditional anonymity of the signer. Proxy ring signature is the combination of proxy signature and ring signature. Previous proxy ring signature schemes are constructed based on the idea of ring signature to provide the privacy protection for the proxy signer while the identity of the original signer is public. A new proxy ring signature scheme based on the difficulty of RSA problem is proposed in this paper, which can provide the privacy protection for both the proxy signer and the original signer. It proves that the proposed scheme can resist the adaptive chosen-message attack in the random oracle model.