基于身份的强不可伪造代理重签名方案

ID-based proxy re-signature scheme with strong unforgeability

针对代理重签名方案的存在性不可伪造问题,利用目标抗碰撞杂凑函数和双线性映射,提出了一种基于身份的双向代理重签名方案。在计算Diffie-Hellman困难问题的假设下,证明了该方案在适应性选择消息攻击下是强不可伪造的。所提方案的系统参数和重签名的长度短,重签名的计算量小,解决了现有代理重签名方案中存在的密钥管理复杂和安全性低等问题。

Concerning the problem that ID-based proxy re-signature schemes are existentially unforgeable, an ID-based bidirectional proxy re-signature scheme was proposed by using target collision-resistant Hash function and bilinear pairing.Under computational Diffie-Hellman assumption, the proposed proxy re-signature scheme is provably secure against strongly forgery under adaptive chosen message attacks. Moreover, the proposed scheme has short system parameters, short resignature, low re-signing computation cost and high security. The proposed scheme solves the existing proxy re-signature in the presence of low security and complex key management.