一种引入通配符的身份密码密钥更新机制

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。

Research on Key Updating Issues of IBE with Wildcards

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.