可证明安全的基于证书密码体制及其拓展研究

项目名称： 可证明安全的基于证书密码体制及其拓展研究

项目编号： No.61272542

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： 李继国

作者单位： 河海大学

项目金额： 82万元

中文摘要： 在2003年欧密会议上，Gentry首次提出了基于证书密码体制。由于它既保持了传统公钥密码体制、基于身份密码体制和无证书密码体制的优点，又弥补了其固有的缺陷，所以受到国内外密码学者的广泛关注。然而,由于这是一个很难的课题,所以这方面仍存在"安全模型不完善"、"信息泄露"、"标准模型下的安全性证明"、"紧规约"、"通用构造"等关键性问题没有解决。本项目针对这些关键问题，研究基于证书密码体制的强安全模型和可证明安全方法；设计安全、高效的基于证书加密方案、签名方案、签密方案、具有特殊性质签名方案和具有紧安全规约的签名方案并在随机预言模型或标准模型下证明方案的安全性；探索基于证书签名的通用构造方法和基于证书密码的密钥泄露保护方法，为基于证书密码体制的广泛应用提供技术支撑。本课题所研究的内容均为基于证书密码体制中非常重要而且亟待解决的问题，因而具有非常重要的理论意义和实用价值。

中文关键词： certificate-based signature；certificate-based encryption；security；leakage resilience；

英文摘要： In Eurocrypt'2003, Gentry first proposed the certificate-based cryptography, which keep the advantages of the traditional public key cryptography, the identity-based cryptography and the certificateless cryptography, at the same time, overcomes their inherent defect. Since it is proposed, the certificate-based cryptography attracted more attention abroad. Because it is very hard research topic, there are some important problen (security model, information leakage, security proof in the standard model, tight reduction, general construction) to be sloved.In allusion to the existing problem in the certificate-based cryptography, we present strong security model and provably secure methods of the certificate-based cryptogaphy. We propose some secure and efficient certificate-based encryption schemes, signature schemes, signcryption scheme, signature schemes with special properties, signature scheme with tight reduction and analyse the computation cost and communication cost. The proposed scheme are proved secure in random oracle model or standard model. We propose the general constrution of the certificate-based signature scheme.In an effort to address the key exposure problem, we propose the leakage-resilient certificate-based cryptography, which supply technical support for wide application of the certificate-ba

英文关键词： certificate-based signature；certificate-based encryption；security；leakage resilience；