一种无证书的代理环签名方案

A Certificateless Proxy Ring Signature Scheme

2003年,Zhang等人提出了代理环签名方案,具有代理签名和环签名的优点,在代理人代表授权人签名时,能提供代理人的匿名性。鉴于无证书密码体制的优点,在一种无证书的环签名的基础上,并在授权时采用短签名方案,提出一种无证书的代理环签名方案,该方案不需要证书的管理,也没有密钥的托管问题,并且满足代理环签名所要求的可验证性,无条件匿名性,不可伪造性,不可否认性,可鉴别性等性质。

Zhang et al. proposed a proxy ring signature scheme in 2003. It has advantages of proxy signature and ring signature. It is very useful when proxy signer need to sign message on behalf of the original entity while providing anonymity. Based on the merit of certificateless public key cryptography, in this paper, we propose a certificateless proxy ring signature scheme by a certificateless ring signature scheme and a short signature scheme. The result shows that the certificateless proxy ring signature scheme not only solves all the problems of certificate management and Key escrow, but also satisfies all the required characteristics （ for example, verifiability, unconditional anonymity, unforgeability, undeniability or distinguishability） of proxy ring signature.