基于椭圆曲线防滥用的代理签名

首先分析了Mambo-Usuda-Okamoto的代理签名方案的不足,通过引入MUO代理签名及椭圆曲线算法,将ECDSA应用于MUO方案。该方案将授权期限、授权范围、代理人的特征信息等授权信息附加在待签名的信息中,利用可信中心设计出了一个防代理人对代理权滥用及可限制代理人权限的代理签名方案,验证了它满足数字代理签名所必须的几种性质,并提高了基于椭圆曲线代理签名的安全性和实用性。

A Misuse Preventive Proxy Signature Based on Elliptic Curve

In respect to the shortcomings of Mambo-Usuda-Okamoto's proxy signature, this paper proposes a new proxy signature scheme by introducing MUO proxy signature and elliptic-curve algorithm, and applying ECDSA into MUO. It adds into the signature information the authorized information, authorized scope and the characteristics of proxy. Through the use of CA, this scheme can avoid misuse and limit the proxy's purview. Besides, the author testifies some of the properties that are needed in digital proxy signature and proves the safety and practicality of the scheme.