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ID:34183564
大小:1.15 MB
页数:56页
时间:2019-03-04
《基于标准模型无证书门限代理重签名的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、2基于标准模型的无证书门限代理重签名研究摘要3摘要门限代理重签名不仅能防止代理者签名权利过分集中而被滥用,还可保证重签名密钥的安全性和完整性。目前,门限代理重签名方案大多是基于证书或者基于身份的,不可避免的存在密钥托管及证书管理复杂等问题。无证书的公钥密码体制解决了证书管理复杂及密钥托管等问题,效率比传统的PKI的公钥密码体制高,安全性比基于身份的公钥密码体制强。因此,它在移动设备、无线传感器网络等需要低带宽和低处理能力的环境下具有广泛的应用前景。本文首先基于无证书公钥体制设计了基于无证书的门限代理重签名方案,方案中私钥生成中心只能生成部分私钥,故其不能
2、够伪造合法用户的签名,从而解决了密钥托管问题。其次,考虑到在随机预言模型下可证安全的密码体制,当具体的哈希函数取代随机预言机时,所得方案不一定是安全的。本文运用双线性对技术以及Paterson-Schuldt提出的标准模型签名的框架证明了该方案的安全性。方案安全性是基于TypeI类型下NGBDH问题的多项式时间内的求解困难性和基于TypeII类型下Many-DH问题的多项式时间内的求解困难性。同时,方案是健壮的,能容忍t3、书门限代理重签名研究AbstractThresholdProxyresignaturemechanismcannotonlypreventthesignaturerightsoftheagentover-concentrationoftheabuse,butalsoensurethesecurityandintegrityofre-signingkey.Thresholdproxyre-signatureschemesaremostlybasedonthecertificateoridentity,whichsufferfromeitherthecomp4、lexityofkeyescrowproblemorcertificatemanagement.Certificatelesspublickeycryptosystemsolvethecomplexityofcertificatemanagementandkeyescrowproblem,ismoreefficientthantraditionalPKIpublickeycryptographysystem,ismoresecurethantheidentity-basedpublickeycryptosystem.Therefore,ithasbroa5、dapplicationprospectsintheenvironmentalconditionsofthemobiledevices,wirelesssensornetworksthatrequirelowbandwidthandlowprocessingcapacity.Firstly,acertificatelessthresholdproxyre-signatureschemebasedoncertificatelesspublickeycryptosystemisdesigned,theprivatekeygenerationcentercan6、onlygeneratepartoftheprivatekey,itcannotforgethesignatureofthelegitimateusers,soastosolvethekeyescrowproblem.Secondly,takingintoaccountthecryptosystemprovablysecureundertherandomoraclemodel,whenthespecifichashfunctionreplacestherandomoracle,theresultedschemeisnotcompletelysecure.7、Therefore,theuseofbilinearonthetechnologyandtheframeworkofthestandardmodelproposedbyPaterson-Schuldtcanprovethesecurityofthescheme.SecurityisbasedonthedifficultyofsolveTypeITypeNGBDHprobleminpolynomialtimeandthedifficultyofsolveTypeIITypeMany-DHprobleminpolynomialtime.Andtheschem8、eisrobust,itcantoleratet
3、书门限代理重签名研究AbstractThresholdProxyresignaturemechanismcannotonlypreventthesignaturerightsoftheagentover-concentrationoftheabuse,butalsoensurethesecurityandintegrityofre-signingkey.Thresholdproxyre-signatureschemesaremostlybasedonthecertificateoridentity,whichsufferfromeitherthecomp
4、lexityofkeyescrowproblemorcertificatemanagement.Certificatelesspublickeycryptosystemsolvethecomplexityofcertificatemanagementandkeyescrowproblem,ismoreefficientthantraditionalPKIpublickeycryptographysystem,ismoresecurethantheidentity-basedpublickeycryptosystem.Therefore,ithasbroa
5、dapplicationprospectsintheenvironmentalconditionsofthemobiledevices,wirelesssensornetworksthatrequirelowbandwidthandlowprocessingcapacity.Firstly,acertificatelessthresholdproxyre-signatureschemebasedoncertificatelesspublickeycryptosystemisdesigned,theprivatekeygenerationcentercan
6、onlygeneratepartoftheprivatekey,itcannotforgethesignatureofthelegitimateusers,soastosolvethekeyescrowproblem.Secondly,takingintoaccountthecryptosystemprovablysecureundertherandomoraclemodel,whenthespecifichashfunctionreplacestherandomoracle,theresultedschemeisnotcompletelysecure.
7、Therefore,theuseofbilinearonthetechnologyandtheframeworkofthestandardmodelproposedbyPaterson-Schuldtcanprovethesecurityofthescheme.SecurityisbasedonthedifficultyofsolveTypeITypeNGBDHprobleminpolynomialtimeandthedifficultyofsolveTypeIITypeMany-DHprobleminpolynomialtime.Andtheschem
8、eisrobust,itcantoleratet
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