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代理重签名具有转换签名的功能,可广泛应用于云存储、身份认证、版权管理等领域.标准模型下的代理重签名方案多数是存在性不可伪造的,无法阻止攻击者对已经签名过的消息重新伪造一个合法的签名.为了克服已有代理重签名方案的安全性依赖强、重签名长度长和计算代价大等缺陷,利用目标抗碰撞杂凑函数提出了一种新的多用双向代理重签名方案.在计算性Diffie-Hellman困难问题的假设下,证明新方案在适应性选择消息攻击下是强不可伪造的.与已有强不可伪造的双向代理重签名方案相比,新方案的系统参数、签名和重签名的长度短,重签名的计算量小,且满足更多的安全属性.
Proxy re-signature has the function of conversion signature, which can be widely used in the fields of cloud storage, identity authentication, copyright management, etc. The proxy re-signature scheme in the standard model is mostly existence unforgeability and can not stop the attacker from signing the signed message Re-falsify a valid signature.In order to overcome the shortcomings of the existing proxy re-signature schemes, such as strong dependence on security, long re-signature length and high computational cost, a new multi-purpose bidirectional proxy re-signature scheme is proposed by using the target anti-collision hash function Under the assumption of computational Diffie-Hellman problem, it is proved that the new scheme is strong and unforgeable under the attack of adaptive choice message.Compared with the existing rewritable scheme with strong and unforgeability, the new scheme’s system parameters, Signed and re-signed short length, re-signed a small amount of computation, and to meet more security attributes.