基于身份的广播加密算法改进

Improvement of identity-based broadcast encryption algorithm

为了在信息技术迅速发展的前景下达到保护版权的目的,采用理论分析及实验的方法对于经典的基于身份的广播加密方案(IBBE)的算法进行算法上的改进,包括密文头的设计、私钥的设计以及解密算法的设计.研究结论表明:新的算法可以在密文头大小、私钥大小以及解密时间上都有很大的改进,在这些方面都要远远好于原始算法.由于当前广播加密算法都受限于额外的加密负载,该算法可以有效地减少传输消耗以及用户端存储消耗,同时,解密算法的改进可以加快解密的速度.新的基于身份的广播加密算法使得基于身份的广播加密方案具备了应用于实际中的理论基础.

In order to protect the digital copyright in the context of fast development in information technologies,this study improves the algorithm of identity-based broadcast encryption using theoretical and experimental methods.The improvement focuses on the design of encryption header,secret key and decrypt algorithm.The experiments show that new algorithm has great advantages in the design of encryption header,secret key and decrypt computation.The algorithm developed could reduce the transmission cost,secret key storage cost and decrypt time cost.Therefore,the algorithm of identity-based broadcast encryption developed establishes a theoretical basis for its practical applications.