摘要： 广播加密方案是一种应用广泛的群组安全通信方案，在付费电视、视频会议和无线传感网络等场合具有良好的应用前景。该文针对许多基于二叉树结构的方案在中心控制密钥量 上作了一些改进，提出了一个安全的基于广播加密的会话密钥分配方案。新方案在中心密钥存储量上有明显的优势，同时能安全有效地完成密钥的分发、用户添加以及加密密钥更新等功能。

关键词: 广播加密, 密钥分配, 伪随机函数, 预留节点

Abstract: Broadcast encryption scheme is wildly used in group communications, such as pay-TV, video-conferencing, wireless and sensor networks etc. In many hierarchical binary tree-based schemes, Group Center (GC) needs spaces to store all related keys. This paper presents a secure session key distribution scheme based on broadcast encryption. The scheme reduces the key storage requirement of GC to a constant size, which is far better than that of the previously proposed schemes and can securely distribute key, join new users and renew encryption-keys successfully.

Key words: broadcast encryption, key distribution, pseudo-random function, preserved nodes

中图分类号: 

• TP309