可公开验证的代理重加密签密方案  

Signcryption of proxy re-encryption with publicly verification

作　　者：李海峰[1] 蓝才会[2,3] 

机构地区：[1]天水师范学院物理与信息科学学院,甘肃天水741001 [2]西北师范大学数学与信息科学学院,兰州730070 [3]兰州城市学院信息工程学院,兰州730070

出　　处：《计算机应用》2013年第4期1055-1060,共6页journal of Computer Applications

基　　金：国家自然科学基金资助项目(61163038);甘肃省自然科学基金资助项目(3ZS051-A25-042);天水师范学院科研项目(TSE0810)

摘　　要：已有的代理重加密签密的方案仅仅提供了不可否认性,其安全强度弱于适应选择选择消息下不可伪造性。因此,定义了在适应选择消息下不可伪造的安全模型,同时提出了一个新的代理重加密签密方案,新方案的授权人和受理人的签密文本都具有公开可验证性,并且新方案在随机预言模型下可证明安全,且该方案安全高效,适用于安全级别要求较高的实际应用领域。The existing SignCryption with Proxy Re-Encryption（SCPRE） only provides non-repudiation and its security is weaker than that of the adaptive chosen message attack.Since there are two kinds of signcryption texts,the authors respectively provided two definitions for unforgeability： one was first-level signcryption text＇s unforgeability produced by the delegator and the other was second-level signcryption text＇s unforgeability produced by the delegatee.A new signcryption with proxy re-encryption scheme was also proposed,of which the first-level signcryption text and the second-level signcryption text all meet the publicly verifiable requirements,and its security can be proved under random oracle model.And the proposed new scheme is secure and effective.Therefore,this scheme is suitable for high security level requirements of the practical application areas.

关 键 词：签密 代理重加密签密 随机预言模型 可公开验证 不可伪造性 选择密文安全性 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]