Abstract: This paper proposes a novel group key update scheme based on the analysis of the existing group key schemes. It uses the one-way function, XOR operation and the pseudo-random function to reduce the storage complexity and computation, and uses the group key which is based on time series to increase security, introduces two variables which divide the key update process into two parts, the necessary update and the auxiliary update, it significantly reduces the number of logic update. Analysis shows that the robustness and scalability of the program is good and it has a widely scope of application.

Key words: multicast communication, secure multicast, group key update, one-way function, XOR operation

摘要： 在分析现有组密钥更新机制的基础上，提出一种基于逻辑密钥树的密钥更新方案，该方案使用单向函数、XOR运算和伪随机函数等降低存储复杂度和计算量。使用基于时间序列的组密钥增强了安全性，并引入2个变量将密钥的更新过程分为必要更新与辅助更新 2个部分，减少逻辑密钥更新的次数。分析结果表明，该方案适用范围广，具有较好的鲁棒性和可扩展性。

关键词: 组播通信, 安全组播, 组密钥更新, 单向函数, 异或运算

CLC Number: 

• TP393