一种基于身份的门限签名方案的密码分析与改进

Cryptanalysis and improvement of an ID-based threshold signature scheme

目的对文献中的基于身份的签名方案进行密码分析。方法借助有限域上求解离散对数问题的困难性给出一个攻击。结论与结果给出一个改进方案,改进后的方案克服了原方案中的安全漏洞,同时保持原方案的其他安全特性。

Aim To analyze an ID-based threshold signature scheme in literature. Methods httack on the scheme is proved by means of the difficult problem of discrete logarithm on finite field. Results and Conclusion Based on the scheme, a modified scheme is proposed in the paper. The improvement resists the insider conspiracy attack and maintains other security of the original scheme.