摘要：

基于传统公钥密码体制的条件代理重加密已较为成熟,但在细粒度的层次上基于身份的代理重加密方案难以控制代理人权限。为此,提出一种基于身份的条件代理重加密方案。通过在随机预言模型下将方案的安全性规约到DBDH问题,以证明在自适应攻陷模型下的选择密文安全性。分析结果表明,与传统加密方案相比,该方案实用性强,效率高,安全性较好。

关键词: 基于身份, 代理重加密, 随机预言模型, 可证明安全, 选择密文安全

Abstract: The conditional proxy re-encryption based on the traditional public key cryptosystem is mature,but the Identity-based Proxy Re-encryption(IBPRE) scheme,controlling agents’ permissions from the fine-grained level is a problem needed to be solved.Thus,this paper proposes an identity-based conditional proxy re-encryption scheme.The security of the scheme is proven equivalent to the DBDH problem,and its chosen-ciphertext security in the adaptive corruption model is proved in the random oracle model.Security analysis results show that,compared with other schemes,this scheme has better security,practicality and higher efficiency.

Key words: identity-based, Proxy Re-encryption(PRE), random predicting model, provably secure, chosen ciphertext security

中图分类号: 

• TP309