条件代理重加密关键问题的研究

项目名称： 条件代理重加密关键问题的研究

项目编号： No.61272413

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 自动化技术、计算机技术

项目作者： 翁健

作者单位： 暨南大学

项目金额： 81万元

中文摘要： 条件代理重加密是近年来密码学领域的一个热点研究话题，它在数字版权保护、加密电子邮件转发和云计算等场合有着广泛的应用。目前，条件代理重加密领域还存在大量亟需解决的关键问题。为此，本项目将对条件代理重加密的如下问题展开研究：(1)研究如何为条件代理重加密定义更为严格合理的安全模型；(2)设计无需双线性对、不依赖随机谕示模型且在严格安全模型下可证明安全的条件代理重加密方案，解决Canetti-Hohenberger公开问题；(3)研究严格模型下可证明安全的条件代理重加密通用构造方法，间接得到基于格困难问题的条件代理重加密方案；（4）研究条件代理重加密的代理者权限控制问题，包括设计条件表达式细粒度化和匿名化的条件代理重加密方案，以及门限条件代理重加密方案；(5)研究条件代理重加密的密钥泄露保护机制问题。本项目的研究内容将能丰富条件代理重加密的理论，并能为条件代理重加密的进一步广泛应用奠定基础。

中文关键词： 条件代理重加密；选择密文攻击；基于身份加密；属性加密；同态加密

英文摘要： Conditional proxy re-encryption (CPRE) has recently become a hot topic in cryptography research field, and it has found many practical applications such as digitial right protection, encrypted email forwarding, cloud computing, etc. Up to now, CPRE still has a lot of important problems needed to be resolved. In review of this, this project will concentrate on the study of the following problems：(1) How to formalize stronger security model for CPRE; (2)How to design a CPRE scheme secure in the stronger security model, relying on neither bilinear pairings nor random oracle heuristics. Such a CPRE scheme can be implicitly viewed as a solution to the Canetti-Hohenberger open problem left in ACM CCS 2007; (3)Study the generic construction of CPRE provably secure in the stronger security model; (4) Study the delegation control of the proxy for CPRE, including the design of CPRE scheme with fine-grained and anonymous condition， as well as threshold CPRE scheme; (5)Study the key-exposure protection mechanism for CPRE. This project can further enrich the theory of CPRE, and will be conducive to the wider application of CPRE.

英文关键词： conditional proxy re-encryption；chosen-ciphertext attacks；identity-based encryption；attribute-based encryption；homomorphic encryption