摘要
基于椭圆曲线和Weil配对数学理论发明了具体可实施的基于身份密码的技术方案,但其一大缺陷就是密钥更新问题。介绍了一种时间分层的基于身份密码技术的算法和系统,其采用多个主密钥分量,逐级更新用户私钥,与PKG对接的顶级中间设备的帮助密钥更新时间相对较长,而用户终端保存的用户私钥更新时间相对较短,这样既满足了用户私钥更新频度的需要,又不引起系统频繁更新用户私钥所造成的沉重负荷。
A practical identity-based cryptography（IBC） scheme is respectively invented,based on elliptic curves and a mathematical construct called the Weil pairing,but a big limitation of it is the key update.Then an algorithm and system of IBC technology based on time hierarchy is introduced,which adopts a number of main key components and gradually updates user’s private key.The help key of top middle equipment docking with PKG updates the relatively long time,while the user’s private key updates the relatively short time,therefore this meets the user’s private key update frequency needs and doesn’t bring the heavy burden to the system.
出处
《计算机工程与设计》
CSCD
北大核心
2009年第24期5591-5593,共3页
Computer Engineering and Design
关键词
基于身份密码技术
私钥生成中心
椭圆曲线
配对
identity-based cryptography
private key generator（PKG）
elliptic curve
pairing
