自我强化的基于身份的广播加密方案  

Self-enforcing ID-based Broadcast Encryption Scheme

作　　者：杨晨[1] 马文平[1] 王新梅[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,陕西西安710071

出　　处：《四川大学学报（工程科学版）》2007年第3期133-135,共3页Journal of Sichuan University (Engineering Science Edition)

基　　金：教育部新世纪优秀人才支持计划资助项目;国家自然科学基金资助项目(90604009;60373104)

摘　　要：为了有效解决广播加密系统中的密钥泄漏和密钥管理的问题,提出了一个新的实用的基于身份的广播加密方案。利用超椭圆曲线上的双线性对构造广播加密和解密算法,节省了广播通信传输带宽。引入了密钥自我强化保护机制,在分配用户密钥时通过用户的机密信息计算其解密密钥,降低了用户为保护自己的利益而泄漏其密钥的可能性。证明了方案在扩展的k元BDHI假设下对抗k用户合谋攻击的安全性。To efficiently solve the private key leak and management problems in broadcast encryption systems, a new efficient practical ID-based broadcast encryption scheme was presented. The bilinear paring on a super-elliptic curve was used to construct the broadcast encryption and decryption algorithms, which greatly saves the broadcasting communication transmission bandwidth. In the key distribution process, self-enforcing protection strategy was introduced by computing one user＇ s decryption key through his secret information, which reduces the risk for one user of leaking his private keys. Security proof against k-collusion attack under the difficulty of extended k-BDHI assumption was given.

关 键 词：广播加密 密钥管理 双线性映射 公钥基础设施 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]