具有前向安全性质的限制次数代理签名方案

A Forward-Security Proxy Signature Scheme Restricting Signing Times

借鉴前向安全的数字签名的思想,利用已有的基于Fiat-Shamir的代理签名方案,引入两个验证参量,修改签名、验证等式及过程,构造了一个具有前向安全特性的代理签名方案。方案的安全性基于大整数因子分解的难度。在本方案中。代理签名者的代理密钥是前向安全的,代理签名者每签名一次即改变代理密钥,在代理签名中同时包含签名的次数,原始签名者通过公布允许签名的次数来限制代理签名者签名的次数。

On the inspiration from forwardsecurity signature scheme, we establish a forwardsecurity proxy signature scheme which can restrict signing times. In this scheme, the key of proxy signer has forwardsecurity property. When he signs a message, the proxy signer changes his proxy signing key each time. The number of signing times is included in the signature. The original signer can limit the number of the proxy singer′s signing time by publishing the number he permitted.