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提出一种基于RSA算法实现的广播加密方案,方案采用的是树形结构,密钥生成和分配过程简介,并且传输开销和存储开销与用户数量以及授权用户数量都没有关系,为常量级。与其它使用计算量较大的双线性映射构造的性能相同的方案相比较,本方案计算量较小。同时非授权用户不能通过共谋构造出一个不同的解密钥,即方案具有抗共谋性。方案能够实现对恶意共享解密钥的叛逆者的追踪。
This paper proposes a broadcast encryption scheme based on RSA algorithm. The scheme adopts a brief introduction of tree structure, key generation and distribution process, and the transmission overhead and storage overhead are not related to the number of users and the number of authorized users. Comparing with other schemes that use the same performance of the bilinear mappings with large computational complexity, this scheme has less computational complexity. At the same time, non-authorized users can not construct a different decryption key through complicity, that is, the solution has the anti-complicity. The scheme can track the rebels who maliciously share the decryption key.