可证安全的新型签密体制研究

项目名称： 可证安全的新型签密体制研究

项目编号： No.61462048

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 自动化技术、计算机技术

项目作者： 周才学

作者单位： 九江学院

项目金额： 41万元

中文摘要： )：通常加密使用加密算法和加密密钥，签名使用签名算法和签名密钥，这两个算法和两对密钥相互独立。但从提高效率的观点来看，如果加密和签名能共用一个算法和一对密钥，则这种用法能减少系统的存储空间、降低密钥管理的开销和减少验证密钥的时间，并且当系统的功能需求有变化时改动的代价最小。本项目考虑签名和签密共用一个算法和一对密钥的问题,研究其相应的形式化定义、安全模型和具体的方案，包括基于公钥基础设施PKI、基于身份、基于无证书和基于证书的方案，研究具有特殊性质的签名和签密共用算法和密钥的方案，包括环签名、群签名、聚合签名、代理签名和门限签名及相应的签密共用算法和密钥的方案，然后在随机预言机模型或标准模型中证明这些方案的安全性，并探索相应方案的密钥泄露保护方法。这样的研究将为具有大量用户的系统、存储空间受限的系统和功能需求有变化的系统带来效率上的显著提高，因而具有重要的理论意义和实际应用价值。

中文关键词： 签密；广义签密；组合公钥密码体制

英文摘要： In general, encryption uses encryption algorithm and encryption key pair, and signature uses signature algorithm and signature key pair. These two algorithms and two key pairs are mutually independent. However, from the perspective of efficency improvement, if encryption and signature can share the same algorithm and the same key pair, then this can save storage space, reduces the costs of key management, shortens the time needed to verify key pair, and minimize the cost of change when the system functional requirements vary. This project considers signature and signcryption sharing one algorithm and one key pair,studies the associated formalized definition, security model and concrete schemes,includes PKI-based schemes,identity-based schemes,certificateless-based schemes and certificate-based schemes, studies special schemes with signature and signcryption sharing one algorithm and one key pair, including group signature,aggregate signature,proxy signature and threshold signature and the associated signcryption schemes sharing one algorithm and one key pair, and then proves these schemes are secure in the random oracle model or in the standard model, and explores the key exposure protection methods for corresponding schemes. Such studies will significantly improve the efficency of systems with a large number of users, storage-constrained environments and changes in the functional requirements，thus they are of greate theoretical significance and practical value.

英文关键词： signcryption;generalized signcryption;combined public key cryptosystems