具有固定公钥和私钥长度的广播加密方案

摘要

Using efficiently computable bilinear maps, a new broadcast encryption scheme was proposed.The scheme was proven IND-ID-CPA security in the standard model.In this scheme, the public key and private key are constant size,and the ciphertext size is very short.Moreover, the scheme is fully collusion resistant.Compared with existing broadcast encryption schemes, the new scheme is more appropriate for low storage devices.%利用双线性配对技术提出一个新的基于身份的广播加密方案.在标准模型下,证明了该方案具有适应性攻击安全模型下选择明文安全性.方案中的公钥参数和用户私钥均为固定长度,密文长度较短,并且,新方案还满足完全抗同谋攻击.与现有的广播加密方案相比,新方案更适用于存储量小的系统.