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时间:2020-04-10
《标准模型下可证明安全的分级身份签名方案.pdf》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、!45"!2#!"#$%&&'Vol.45No.22011$2%JOURNALOFXI′ANJIAOTONGUNIVERSITYFeb.2011!"#$%&'()*+,-./0123-.1,3451,STU2,VWX1(1.YZ[F]^G_`abGc,710071,YZ;2.YZ[F]^GdGc,710071,YZ)45:()*+,-./0123456"789:;<=./>?、@ABCD,EFGHIJKLMNOP"7Q*+,-./01.RSQ01$TU./VWXYZ[(G]^_`abC,cdX01efZ[`a*ghi,)501jklSmnoQpq,:;Ur:Qmn+so
2、,"78PtpuvwRS01.01Q"78pq_RU:"78OPxuy7,-QIJKL,"78z{uBCDiffieHellman(CDH)
3、},9~CDH
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5、}ckuf,01lSQ"78.01Qmnpq_RU:./>?(T,OVW`a38fbC,>?+Qc.82*"78*P,dX01Q"78mnpuRS01.678:IJKL;NOP"7;*+,-;./;8;¡¢£&9:,;<:TP309=>!?@:A=AB<:0253?987X(2011)02?0027?07犘狉狅狏犪犫犾犲犛犲犮狌狉犲犎犻犲狉犪狉犮犺犻犮犪犾犐犱犲狀狋犻狋狔犅犪狊犲犱犛犻犵狀犪狋
6、狌狉犲犛犮犺犲犿犲犻狀狋犺犲犛狋犪狀犱犪狉犱犕狅犱犲犾1,HUYupu1,ZHANGLeyou2,SUNChunhui1YANGYang(1.SchoolofCommunicationEngineering,XidianUniversity,Xi′an710071,China;2.SchoolofScience,XidianUniversity,Xi′an710071,China)犃犫狊狋狉犪犮狋:Aimingattheintrinsicproblemsinhierarchicalidentitybasedsignature(HIBS)schemes,suchasenhanc
7、ingthesecurity,shorteningthesignaturelength,andreducingthecomputationalcosts,anovelhierarchicalidentitybasedsignatureschemeisproposed.Theavailableschemesalwayshandlethemessageasanentiretyinthesignatureprocess;whileourschemeprocessesthemessageassegmentssothattheschemeisnotonlyefficientbutal
8、soachieveshighersecuritylevel.Thesuggestedschemeismoresecurethantheexistingschemessinceitisprovedsecureinthestandardmodeloverfullidentityadaptivechosenmessageattack,anditssecurityisreducedtocomputationalDiffieHellman(CDH)assumption.ThehardnessofCDHassumptionissuperiortotheotherassumptionse
9、xceptthediscretelogarithmproblem.Thenewschemehassomeefficiencyadvantagesovertheavailableschemes:thesizeofthesignatureisaconstant,verificationrequiresonlythreebilinearpairingoperations,andtheprivatekeyssizeshrinksastheidentitydepthincreases.Theefficiencyandsecurityanalysisshowsthatthepropos
10、edschemeismoresecureandefficientcomparedwiththeexistingHIBSschemes.犓犲狔狑狅狉犱狊:standardmodel;provablesecure;hierarchicalidentity;signature;bilinearmap;publickeycryptography[1?3]e>fghijklm7no,pqrs2tou(PKG)vwxyz{g
11、,}~KPKG&'(#:2010?06?08.)*+,:-.(1984-),/,012;
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