可证安全的高效可托管公钥加密方案.pdf

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1、357
Vol.35No.72014
7JournalonCommunicationsJuly2014doi:10.3969/j.issn.1000-436x.2014.07.004

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2、BCD6EF8,GHIJK+3BA1LMNG'LMOPQRSODiffie-HellmanT+UVWXYYYLMTP309UAU1000-436X(2014)07-0033-05Provablysecureandefficientescrowablepublickeyencryptionschemes1121LIUWen-hao,WANGSheng-bao,CAOZhen-fu,HANLi-dong(1.SchoolofInformationScienceandEngineering,H

3、angzhouNormalUniversity,Hangzhou310012,China;2.DepartmentofComputerScienceandEngineering,ShanghaiJiaotongUniversity,Shanghai200240,China)Abstract:Inanescrowablepublickeyencryption(E-PKE)scheme,therearetwokeysassociatedwithonepublickey.Itcanreducethetotalnumberofcertificate

4、sinthepublickeyinfrastructure(PKI)toalargeextent,thusdegradethecom-plexityofcertificatemanagement.Moreover,anE-PKEschemecanalsoreducethekeystorageforendusers.Twosuchschemeswereproposed,withthesecondonebeingthemostefficientoneamongallexistingE-PKEschemes.Itisalsothefirstpro

5、vablysecureE-PKEscheme,whosesecurityisbasedonthestandardbilinearDiffie-Hellman(BDH)assump-tion.Keywords:cryptographicalgorithm;encryptionscheme;escrowablepublickeyencryption;provablesecuritya(EA,escrowagency)1bcNI*+,-/01
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8、UZ[]^_`ab"c61103209,61170227dYefg]^_`ab"cLZ12F02005dYefghij^_`ab"cY201222977dYklmnopqZ[rstuvwx_`ab"cSKLNST-2009-1-13dFoundationItems:TheNationalNaturalScienceFoundationofChina(61103209,61170227);TheNaturalScienceFoundationofZhejiangProvince(LZ12F02005);Educatio

9、nDepartmentFoundationofZhejiangProvince(Y201222977);TheOpenFoundationaofStateKeyLaborator