安全多播密钥更新机制优化方案

组密钥的安全管理是安全多播的核心问题，目前应用最广泛的组密钥管理方案是基于LKH的。分析了一种已有的安全多播密钥管理方案的优缺点，并在此基础上提出一种新的密钥更新机制。通过加入单向散列函数，一些成员能够自己计算出其所在路径上各结点密钥值，单个成员离开时，由多播组中的一个成员代替密钥服务器进行密钥更新。对方案的通信开销、存储开销和计算开销等性能的分析表明，与LKH及原方案相比，该方案减少了密钥服务器的通信开销和密钥存储量。

Optimized rekeying program for secure multicast

The security management of group key is essential to secure multicast.Currently,group key management programs based on LKH are most widely used.This paper analyzes the advantages and disadvantages of a key management program for secure multicast,and proposes a new rekeying program based on it.By adding one-way hash function,some users can calculate the keys along the path from their own point to root by themselves,and during a departure procedure,one user is selected to perform rekeying operation instead of...