Abstract: Through the security analysis of two forward secure proxy signature schemes based on bilinear pairings，it finds the schemes having security omission and no forward security.A new forward secure proxy signature scheme based on RSA signature scheme is proposed，and the security of the proposed scheme is analyzed and discussed in details.The scheme not only can effectively resist the forgery attacks and satisfy all security properties of proxy signature，but also has the properties of forward security.Even if the current secret key of proxy signer has been leaked，the attacker can’t forge the proxy signature of the past period time.

Key words: proxy signature, RSA signature scheme, forward security, forgery attack

摘要： 对两个基于双线性对的前向安全的代理签名方案进行了安全性分析，发现其方案均存在安全漏洞，并不具有前向安全性。基于RSA签名体制，提出了一个新的前向安全的代理签名方案，并对所提出方案的安全性做了详细的分析和讨论。方案不仅能抵抗伪造攻击和满足代理签名的性质，而且具有前向安全。即使当前时段的代理签名密钥泄露，攻击者也无法得到以前时段的代理签名。

关键词: 代理签名, RSA签名体制, 前向安全, 伪造攻击