关键词: 环签名, 代理签名, 代理环签名, 可证明安全, 计算性Diffie-Hellman问题

Abstract: An efficient proxy ring signature scheme is proposed，the proxy ring signature scheme overcomes the common weakness that the operation field is unreasonable in the step of proxy key generation in the existed proxy ring schemes.The computational cost of bilinear pairings is reduced from O（n） to O（1），the computational efficiency is improved.The unforgeability is proved depending on the CDHP.The proxy ring signature scheme also satisfy the other security requirements of a proxy ring signature scheme： unconditional ambiguity，verifiability，distinguishability.

Key words: ring signature, proxy signature, proxy ring signature, provably security, Computation Diffie-Hellman Problem（CDHP ）