摘要： 基于口令的群密钥协商协议的目的是利用低熵的口令协商出高熵的会话密钥，并利用该会话密钥进行安全的通信，达到成员之间多方安全的要求。引入2个随机数来提高安全性，使用Hash函数对口令进行优化确保口令的新鲜性，提出一个标准模型下的可证安全的基于口令的协议，并对其进行安全性分析。

关键词: 口令, 标准模型, 群密钥协商, 可证安全

Abstract: The goal of password-based group key exchange is to establish a high entropy session key used for secure communication through a low entropy password, reach the multi-security requirement among members. This paper introduces two random numbers to improve security, Hash function is used to optimize the password, makes sure the fressness. It proposes a provably secure password-based protocol under standare model, and gives it the analyse security.

Key words: password, standard model, group key exchange, provable security

中图分类号: 

• TP309