基于多线性映射的高效广播加密方案

Efficient Broadcasting Encryption Scheme Based on Multilinear Map

采用多线性映射的方法构造了适用于新场景的高效广播加密方案,以广播子群为单位通过聚合成员身份信息生成广播公钥,使公钥对子群用户长度达到定长;采用分层的临时公钥动态生成与管理结构,提高了公钥使用效率,避免了密钥管理中心(KGC)性能瓶颈的出现;在保证计算量和网络带宽占用不显著增加的同时,采用多线性映射灵活迁移计算,使广播加密的时间和空间复杂度达到最优的折中.

An efficiency broadcast encryption scheme is presented based on multilinear map.In the scheme,the public key is generated by aggregating the identity information of the target broadcasting sub-group,and constant length of public key is achieved.In large application scenarios,the broadcasting public key is hierarchically generated and managed to avoid performance bottleneck of KGC.Computing burden is well allocated by flexibly transferred multilinear map to make a better balance between time and space consuming with acceptable,while the cost of computing and network bandwidth is acceptable.