双系统密码技术下的身份型广播加密方案  

Identity-based Broadcast Encryption Scheme Using the New Techniques for Dual System Encryption

作　　者：孙瑾[1,2] 胡予濮[1] 

机构地区：[1]西安电子科技大学计算机网络与信息安全教育部重点实验室,西安710071 [2]西安理工大学理学院应用数学系,西安710054

出　　处：《电子与信息学报》2011年第5期1266-1270,共5页Journal of Electronics & Information Technology

基　　金：国家973计划项目(2007CB311201);国家自然科学基金(60970119;60833008)资助课题

摘　　要：考虑到广播加密模式在各种动态网络中广泛的应用前景以及现有的广播加密方案效率与安全性难以兼顾的事实,该文利用Waters双系统密码技术,结合混合阶群双线性运算的正交性,提出一个双系统密码技术下的身份型广播加密方案。该方案建立在标准模型下,具有短的尺寸固定的密文与密钥,同时无需使用任何哈希函数及随机标签,具有较高的计算效率与存储效率。该方案的安全性依赖于3个简单的静态假设,证明结果显示此方案达到了完全安全性的高安全要求级别。According to the broadcast encryption scheme with wide applications in the real world but its security and efficiency can not be taken into consideration in the model simultaneously,a novel identity-based broadcast encryption scheme is proposed by combining with Waters dual system encryption and the orthogonality property of composite-order bilinear groups.Based on the standard model without tags,the scheme can achieve constant-size key and ciphertext.The scheme is proved by using the three static assumptions which do not depend on the number of queries the attacker makes.Furthermore,the analysis results indicated that the scheme of this paper is fully secure and can satisfy the higher efficiency and practice requirement.

关 键 词：双系统密码 基于身份的密码 广播加密 标准模型 可证明安全 

分 类 号：TN918.1[电子电信—通信与信息系统]