无证书签密方案的安全性分析
首发时间:2012-02-20
摘要:无证书签密机制是一种非常有用的密码机制,它能够同时提供无证书加密和无证书签密. 为了满足应用,研究人员已经提出了许多使用双线对构造的无证书签密. 然而,双线性对的计算是一种非常复杂的运算, 从而影响签密机制的性能. 为了提高性能刘文浩等提出了一个不使用双线性对的无证书签密机制. 同时,他们在一种安全模型下证明了这种机制的安全性. 在本文中我们通过具体的攻击来表明刘文浩等的机制在他们的安全模型下是不安全的。
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Security Analysis of a Certificateless Signcryption Scheme
Abstract:Certificateless signcryption is a useful primitive which simultaneously provides the functionalities of certificateless encryption and certificateless signature. Many certificateless signcryption using bilinear pairings have been proposed. However, bilinear pairing is regarded as an expensive cryptographic primitive in terms of complexity. To improve performance, Liu et al.[LIU Wen-Hao, XU Chun-Xiang, Certificateless Signcryption Scheme Without Bilinear Pairing, Journal of Software,2011,22(8):19181926] proposed a pairing-free certificateless signcryption scheme, and claimed that their scheme is provably secure in a strengthened security model. Unfortunately, by giving concrete attacks, we indicate that Liu et al. certificateless signcryption scheme is not secure in this strengthened security model.
Keywords: signcryption certificateless random oracle model elliptic curve
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