安全的无证书签密方案

Secure certificateless signcryption scheme

基于离散对数困难问题和双线性对映射知识,提出了一种新的无证书签密方案,该方案能够满足机密性、可验证性、不可伪造性。此外,方案可以避免KGC被陷害,而当出现争端时,方案中的追踪算法也能够对可信中心KGC的积极不诚实行为进行识别,从而实现了真正的不可否认性。由于方案可以识别KGC的积极恶意攻击,所以对可信中心KGC的信任可达到Girault定义的信任等级3。

A new certificateless signcyption scheme is given based on discrete logarithm and bilinear pairing,The new scheme satisfies the properties of confidentiality, verifiability, non-forgeability and so on.Besides, the trusted center KGCin this scheme can avoid being framed and its malicious behaviour can be discovered by the trace algorithm.So,the scheme realizes real non-repudiation and reaches trust level 3 defined by Girault by tracing KGC＇s positive malicious attack.