LHL门限签名方案安全性分析

门限签名是群签名的推广,它在电子商务、身份认证以及信息安全领域有着广泛的应用。门限签名的重要安全要求是防伪造性。LHL门限签名方案是一个不需要可信中心的门限签名方案。根据一种针对它的合谋攻击方法,对LHL方案的安全性进行了分析、研究和探索,发现在LHL方案中通过伪造签名实施攻击无法通过部分签名的验证,同时对LHL签名方案的不足之处进行了一些改进,使其能够兼具匿名性与可追踪性。

Security Analysis of LHL Threshold Signature Scheme

Threshold signature is a generalization of group signature, which is widely used in e-commerce, identity authentication and information security. Anti-forgery is an important security requirement for the threshold signature. The LHL Threshold Signature Scheme requires no trusted center. By analysing and exploring security of the LHL Threshold Signature Scheme against a kind of conspiracy attack, it is found that the phony signatures could not pass the validation of partial signatures, and by some improvement on the LHL threshold signature scheme, it could satisfy the requirement of both anonymity and traceability。