基于公钥广播加密的安全组播方案

应用公钥广播加密进行安全组播的难点是如何更有效地权衡实现代价和安全性.通过引入身份标志区分各个接收者,并利用一组接收者的身份标志代替一般公钥广播加密方案中的组公钥,缩短了系统公钥参数的长度.将新的公钥广播加密方案应用到安全组播通信的过程表明,该方案有效降低了计算和通信代价,且达到了抗选择密文攻击的语义安全性.

Secure multicast scheme based on public key broadcast encryption

The difficulty of utilizing public key broadcast encryption in secure multicast is keep balance between implementation cost and security. Taking identity to differentiate each receiver, and using a group of identities instead of group public key in general public key broadcast encryption schemes, the length of system public key parameters was shorten. The procedures of secure multicast communications utilizing the new scheme show that the new scheme is efficient in decreasing the cost of computation and communication, and reaches the semantic security that can fight against chosen ciphertext attack.