白盒可追踪的属性签名方案

White-box Traceable Attribute Signature Scheme

基于属性的签名协议具有匿名性,且私钥不与用户身份绑定,恶意用户可能利用此性质出售私钥而逃过追究。为此,提出可追踪性属性签名方案,使得系统能够通过泄露的私钥破解匿名性并追踪用户身份。给出具有白盒可追踪性的基于属性数字签名协议的密码学原型。通过将Boneh-Boyen签名算法有机嵌入到用户私钥中,实现白盒可追踪性。分析结果表明,该方案具有可证明安全的不可伪造性和完美隐私性,其时间复杂度与目前最优的可追踪属性签名方案仅相差一个常数。

Attribute-based Signature（ABS） protocol has the property of anonymity, and its private keys are not band to identities. Malicious users might make use of this to leak their private keys for financial benefits. Therefore, this paper proposes a traceable signature scheme, which allows the system to break anonymity and trace the identity by the leaked private key. Acryptography model of attribute-based digital signature protocol along with white-box traceability is presented. It achieves white-box traceability by injecting Boneh-Boyen signature algorithm into private keys. Analysis results show that the scheme has provable security of unforgeability and perfect privacy, and its time complexity differs only one comstant from the current best traceable attribute signature scheme.