一个无证书签密方案的密码学分析  

Cryptanalysis of Certificateless Signcryption Scheme

作　　者：柳菊霞[1] 苏靖枫[2] 

机构地区：[1]洛阳师范学院信息技术学院,河南洛阳471022 [2]河南城建学院计算机科学与工程学院,河南平顶山467036

出　　处：《科技通报》2017年第6期174-178,241,共6页Bulletin of Science and Technology

基　　金：国家自然科学基金资助项目(61202317);河南省自然科学基金(112300410192)

摘　　要：对一个无双线性对的无证书安全签密方案进行分析,指出该方案不能抵抗恶意的KGC的攻击。利用掌握的信息,KGC不仅能够伪造一个有效的签密,而且可以从任意签密密文中恢复出明文。进而提出一种改进方案,改进方案在克服原方案存在的安全缺陷的同时,比原方案少两次点乘运算,且部分密钥的分发不需要安全信道。最后,在随机预言模型下证明了改进方案的安全性。The cryptanalysis of a certificateless signcryption scheme without bilinear pairing shows that the scheme can't be against the malicious attacks of KGC. KGC not only can forge a valid signcryption,but also can recover from any signcrypted message by making use of masterying information. Then an improved certificateless signcryption scheme is proposed, which can not only resolve the security problems existing in the original scheme, but also be two times point multiplication less than the original scheme. Moreover, partial key distribution doesn't require a secure channel in the improved scheme.Finally, the improved scheme is proved to be secure in random oracle model.

关 键 词：双线性对 无证书 签密 随机预言模型 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]