一个限制次数的代理签名方案

A Number-limited Proxy Signature Scheme

为解决现有的签名方案中尚没有有效的对签名次数进行限制的问题,结合前向安全签名和一次性限制代理签名的技术,构造了一个能够限制次数的代理签名方案。方案中代理密钥是前向安全的,每一次进化对应一次签名,进化的次数在系统参数中就被限定了。如果代理人两次用同一代理密钥签名,他的私钥就会被破译。方案不需要第三方,其安全性基于解离散对数的困难性。

There is no valid proxy signature scheme which limits signing times until now. Combining the technique of forward-security signature and a one-time signature scheme, we constructed a proxy signature without TTP which can limit signing times. In the scheme, the proxy key is forward security, every generation refers to s specific signature and the generations time is limited. If the proxy signer wans to use the same proxy key to signature different messages, his private key will be cracked. The scheme＇s security is based on the difficulty of solving the discrete logarithm problem.