改进的基于离散对数的代理签名体制

基于离散对数的代理签名方案，一般分为需要可信中心和不需要可信中心两种。但在现实中，许多特定的应用环境下，一个完全可信的第三方认证中心并不存在，而且在第三方认讧中心出现问题时。吞易对信息的安全性造成直接影响。因此，构造一个不需要可信中心的代理签名方案显得非常重要。它通过对代理授权信息的盲化，加强了信息的安全性，使得授权信息可以在公共信道中传输。这样不但保证了方案在授权阶段的信息保密性，还在一定程度上提高了方案的性能。

An Improved Proxy Signature Scheme Based on Discrete Logarithm

Some proxy signature schemes based on discrete logarithm problem need trusted party to guarantee security. But in reality, it is hard to build a trusted party under some specific application environment. In addition, introduction of a trusted third-party certification may cause problems. Therefore, it is attractive to construct a proxy signature without a trusted party. To enhance security, a proxy signature scheme based on the DLP is proposed. In this scheme, the proxy au- thorization information issued by the original signer is blinded so that it can be transmitted in the public channel. This scheme can guarantee the confidentiality of information authorization stage, and improve performance of the scheme.