【摘要】 辫群是一种非交换的无限群,该群中有许多困难问题是不可解的,如字问题、共轭问题和根问题等,利用这些困难问题可以去设计一些密码协议。介绍了辫群的基本概念、两个重要性质和辫群中的困难问题,在此基础上,利用辫群上的共轭查找问题构造了一个基于身份的代理签名,并对它的安全性进行了分析。更多还原

【Abstract】 The braid groups are infinite non-commutative group.The braid groups have many hard problems that can be utilized to design cryptographic primitives,for example the word problem,conjugacy problem,root problem.This paper proposes the identity-based proxy signature scheme using the conjugacy search problem in the braid groups which are believed to be hard problem,and its security is also analyzed.更多还原