摘要
自从2001年BF-IBE方案提出,各种基于标识的加密机制逐渐发展起来。但由于用户公钥完全公开且不易更改,IBE机制的密钥更新问题亟待解决。具有等级结构的身份密码体制(HIBE)的提出,解决了单个私钥生成中心(PKG)无法满足大用户量应用环境的负担和安全保障问题。文章通过引入通配符提出了WIBE方案,可以对HIBE的用户组进行一次性加密。同时在WIBE基础上提出了WKU方案,是一种以年限为单位的密钥更新机制,对用户公私钥的有效期限进行了管理。
Since BF-IBE was proposed in 2001,a variety of identity-based encryption mechanisms are gradually developed.However,the issue of key update needs to be solved urgently because the public key of a user is fully open and not easy to modify.In order to reduce the burden of a single PKG,hierarchical IBE has been proposed.The paper suggests wildcards and put forward WIBE,which can make one-time encryption for user groups of HIBE.In the meanwhile,WKU is put out based on WIBE,which is a key updating mechanism in the measure of years and manages the expiration date of users' keys.
出处
《计算机与数字工程》
2012年第6期85-87,115,共4页
Computer & Digital Engineering
关键词
基于标识的加密
密钥更新
通配符
identity-based encryption
key management
wildcards