可动态加入的基于身份的群密钥分发方案

构造了一个能够动态确定密钥分发用户集合的基于身份的群密钥分发方案。方案根据用户的身份信息来分配相应的个人解密密钥，并利用椭圆曲线上的双线性映射构造广播加密和解密算法。密钥分发中心只需广播传输较少的常量控制报头信息（仅3个群元素），合法授权用户就可由加密广播信息恢复会话密钥。实现了授权用户抗合谋攻击的安全性及用户的动态加入。

ID-based Group Key Distribution Scheme with Dynamic Joining

A new efficient identity-based group key distribution scheme that can dynamically determine the key distribution user-set is constructed. In the proposed scheme, each user obtains his decryption key based on his identity information from the key distribution center, and the bilinear mapping on Elliptic Curve is utilized to construct the broadcast encryption algorithm and decryption algorithm. The broadcast center only needs to broadcast a controlling header of less constant transmission size (three group elements), and the authorized users can recover the session key correctly from the broadcasting information. Both fully collusion-free security and dynamic joining for users are also implemented.