基于前向安全的代理签名系统的研究与实现

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,将签名委托给他人(代理签名人)替代自己行使签名权。普通的代理签名算法有一个严重的缺陷:一旦签名密钥泄露,以前用该密钥签名的所有文档都失效。将前向安全理论引入到代理签名中,即使代理签名密钥泄露,以前时间段的代理签名仍然有效。同时,在本文中给出了代理签名系统模型,并给出模拟实现。

Research and Implementation of Proxy Signature Based on Forward-Security

Proxy signature is a special digital signature. It allows a signatory, called an original signer, to delegate his signing capability to another called a proxy signatory, to create a signature on behalf of him whom can not sign a message for some reason. Common proxy signature has a serious defect: once key for signature disclosed, document signed by former key for signature is invalid .Therefore, in this paper, theory of forward-security be introduced into proxy signature, although key for signature is disclosed, former proxy signature is valid .And, in this paper, system model of proxy signature is given. Finally, an analog implementation is described.