为了解决基于身份的认证加密方案中用户私钥共享的问题,本文在BF—IBE体制的基础上,结合门限秘密共享方案,提出两个新的改进方案,并与原体制在性能上进行了对比分析,分析表明改进方案的计算成本和通信成本都与原体制相当,但是用户的私钥共享更加安全,最后还对改进体制进行了安全性证明。
In order to solve the user' s private key sharing problem in the authenticated identity-based encryption scheme. This paper, based on the BF-IBE schemes, combined with Threshold Secret Sharing Scheme, proposes two new improvements. With the existing schemes, the poper makes a comparative a- nalysis of performance. Analysis showes that the new nication costs. But the user' s private key sharing is is proved. schemes had the equivalent computing and commu- safer. Furthermore, the security of the new schemes