新的改进的强代理签名方案

A new improved strong proxy signature scheme

目的针对Lee等人(LEE B,KIM H,KIM K.Strong Proxy Signature and Its Applica-tions[A].The 2001 Symposium on Cryptography and Information Security(SCIS 2001)[C].January23-26,2001.)的强代理签名方案中的安全缺陷,给出一个新的改进方案。方法利用有限域上求解离散对数的困难问题和引入参数的方法设计新方案。结果给出了一个安全的强代理签名方案,并且推广到代理多签名方案中。结论通过安全性分析,新方案在保持原方案安全性的基础上还有效的防止了原始签名人的伪造攻击,具有强不可伪造性。

Aim In order to overcome the weakness of Lee et al＇s strong proxy signature scheme （LEE B, KIM H, KIM K. Strong Proxy Signature and Its Applications[A]. The 2001 Symposium on Cryptography and Information Security （SCIS 2001） [C]. January 23-26, 2001. ）, a new improved strong proxy signature scheme will be proposed. Methods The new scheme is designed by means of the difficult problem of discrete logarithm on finite field and random parameter. Results A new improved strong proxy scheme is presented, and the proposed ideal is extended into proxy multi-signature scheme. Conclusion The security analyses of the new scheme show that the improved scheme could resist efficiently forgery attack of original signer as well as keeping the properties of Lee et al＇s scheme the proposed ideal provides strong non-forgeability.