Abstract: Preserving all advantages of identity-based cryptography, certificateless public key cryptography eliminates the key-escrow problem, and also reduces the difficult problem of key management in traditional public key cryptography. Based on the merit of certificateless public key cryptography and combining the advantages of proxy signature and ring signature, the paper proposes a new efficient certificateless proxy ring signature scheme. This scheme solves all the problems of key escrow and certificate management, and satisfies the security requirements of a proxy ring signature scheme. Compared with existing schemes, the computational efficiency of the new scheme is obviously improved.

Key words: ring signature, proxy signature, proxy ring signature, bilinear pairings, certificateless

摘要： 在不失基于身份的公钥体制密钥管理简单的前提下，无证书公钥密码体制克服了其所固有的密钥托管缺陷，简化了传统公钥体制负担过重的密钥管理问题。鉴于无证书密码体制的优点，结合代理签名和环签名的优点，提出了一种新的高效的无证书的代理环签名方案。该方案没有密钥的托管问题，也不需要管理证书，并且满足代理环签名方案所有的安全性要求。与现有方案相比，新方案的有效性显著提高。

关键词: 环签名, 代理签名, 代理环签名, 双线性对, 无证书