山东大学学报(理学版) ›› 2015, Vol. 50 ›› Issue (09): 42-48.doi: 10.6040/j.issn.1671-9352.0.2014.539
樊爱宛, 夏栋梁, 杨照峰
FAN Ai-wan, XIA Dong-liang, YANG Zhao-feng
摘要: 大部分的聚合签名方案存在安全性缺陷和计算效率偏低的问题。通过对两种无证书聚合签名方案进行安全性分析,发现两种方案分别无法抵抗Type I和TypeⅡ的伪造性攻击。针对此类问题,提出了一个改进方案。该方案在签名过程中改变了参数的组合方式,在聚合签名验证中加强了对主密钥和公钥的约束。在计算性Diffie-Hellman困难问题假设下,证明了方案在适应性选择消息攻击下具有不可伪造性。效率分析表明,方案在签名与验证过程中只需要4个双线性对运算,签名的长度是固定的,与同类安全的无证书聚合签名方案相比,改进的方案效率更高。
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