一种椭圆曲线的代理签名方案的分析与改进

Analysis and improvement of a proxy signature based on elliptic curve

对杨青等人提出代理签名方案的分析,指出该方案不具有不可伪造性,且代理授权传输信道必须是安全信道,原始签名者可以伪造代理签名者的签名。针对这些安全缺陷,提出改进的代理签名方案。新方案解决原方案中存在的伪造问题,满足代理签名所必须的性质,且无需安全信道的特点。可应用于电子现金等现实领域。

After analyzing a proxy blind signature scheme proposed by Yang et al.,it was pointed out that the scheme was insecure against the original signer’s forgery attack,need the support of the secure channel.To overcome the security problems existing in Yang＇s scheme,an improved proxy signature scheme was proposed.The new scheme resolved forgery attack in the former scheme and met the security requirement of proxy signature scheme,did not need the support of the secure channel.The analytical results prove that the new scheme is more secure and practicable,and suitable for electronic cash.