一个改进的强代理签名方案

数字签名是密码学的重要问题之一；代理签名是一种特殊的数字签名，它是指当某个签名人（原始签名人）由于某种原因不能签名时，将签名权委托给他人（代理签名人）替自己行使签名权。回顾了Lee等人提出的强代理签名方案和代理多签名方案以及Sun等人提出对其强不可伪造性的分析。在强代理签名方案的基础上，提出了改进的强代理签名方案，该方案具有强不可伪造性，从而可以有效地防止原始签名人对代理签名人进行恶意攻击，并将其推广到代理多签名方案中。

A Modified Strong Proxy Signature Scheme

Digital signature scheme is an important research topic in cryptography.Proxy signature is a special digital signature.It allows a signer,called an original signer,to delegate his/her signing capability to another person,called a proxy signer,to create a signature on behalf of him/her when he/she cannot sign a message for some reason.Lee,et al.'s strong proxy signature scheme and proxy multi-signature scheme are reviewed.Sun,et al.'s analyze on strong unforgeability is mentioned.A modified strong proxy signature scheme with strong unforgeability,which will efficiently prevent an original signer from malicious attacks is presented.The proposed idea is extended into proxy multi-signature schemes.