一种基于多线性映射的高效公钥广播加密方案

针对目前广播加密用户大小子集同时存在的情况,构造了一种高效的广播加密方案。在BWZ14方案的基础上,通过引入撤销用户集合、共享广播加密的部分密文信息,提高了广播加密在同时向大小用户集合发送信息的效率。新方案密文与用户私钥长度均为常数,公钥长度仅为O(lgN)。新方案同时满足标准模型下的选择明文安全性与抗合谋特性。实验结果表明,新方案安全高效,可广泛应用于实际通信中。

An Efficient Broadcast Encryption Scheme Based on Multilinear Maps

A high efficiency broadcast encryption scheme is constructed for the simultaneous existence of large subset and small subset in broadcast encryption. On the basis of the BWZ14 scheme, by introducing the revocation of the user collection and sharing the encrypted ciphertext information of the broadcast, it improves the efficiency of the broadcast encryption to send information to the large user and the small collection at the same time. The length of the new scheme ciphertext and the user private key are constant, and the public key length is only O (log (N)). The new scheme also satisfies collusion resistant properties and chosen plaintext security under the standard model. The experimental results show that the new scheme is safe and efficient and can be widely used in actual communication.