标准模型下的单向可变门限代理重签名方案  

UNIDIRECTIONAL VARIABLE THRESHOLD PROXY RE-SIGNATURE SCHEME IN STANDARD MODEL

作　　者：李海芸[1] 杨小东[2] 

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]西北师范大学计算机科学与工程学院,甘肃兰州730070

出　　处：《计算机应用与软件》2014年第12期307-310,共4页Computer Applications and Software

基　　金：国家自然科学基金项目(61262057)

摘　　要：现有的绝大多数门限代理重签名方案只有一个门限值,但在实际应用中,门限代理重签名体制中联合重签名的代理者个数(门限值)取决于重签名消息的重要性。在Sherman等人提出的代理重签名方案的基础上,利用中国剩余定理提出一个在标准模型下可证明安全的单向可变门限代理重签名方案。分析结果表明,新方案在计算性Diffie-hellman假设下满足强壮性和不可伪造性;在效率上优于已有的同类签名方案。根据可变的门限值,每个代理者都能非交互地生成相应的重签名子密钥和验证公钥。Most of current threshold proxy re-signature schemes have only one threshold value.However in practical applications, the proxy number （ threshold value） of joint re-signature in threshold proxy re-signature scheme depends on the significance of the re-signing message.Based on the proxy re-signature scheme presented by Sherman et al, we propose a unidirectional variable threshold proxy re-signature scheme by making use of the Chinese remainder theorem, which is security provable in standard model.Analysis results show that the new scheme satisfies the robustness and unforgeability under computational Diffie-Hellman hypothesis.It outperforms existing similar signature schemes in efficiency.According to variable threshold value, each proxy can generate corresponding re-signature sub-key and verification key non-interactively.

关 键 词：可变门限代理重签名 单向性 中国剩余定理 标准模型 可证明安全 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]