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基于证书的签名方案的分析与改进

DOI: 10.13190/j.jbupt.2013.06.021, PP. 98-101

Keywords: 基于证书的签名,随机预言机模型,双线性对,离散对数假设,公钥替换攻击

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Abstract:

基于证书的密码体制结合了基于公钥基础设施的密码体制和基于身份的密码体制的优点,既简化了公钥的管理又不存在密钥托管问题,对一个无双线性对的基于证书的签名方案进行了密码学分析,指出该方案存在类型Ⅱ攻击者的伪造性攻击和其证明中的不当之处,并用散列函数绑定随机数的方法对其进行了改进.改进方案在离散对数是困难问题的假设下,在最强的安全模型中被证明是安全的.由于不需要耗时的双线性对运算,新方案效率较高,适合于无线传感器网络等能量受限的系统使用.

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