前向安全的密文策略基于属性加密方案.pdf

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1、357
Vol.35No.72014
7JournalonCommunicationsJuly2014doi:10.3969/j.issn.1000-436x.2014.07.005


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CP-ABE,ciphertext-policyattribute-basedencryption!"#$%&'()CP-ABE*+,-./(

2、)012345%67&'()CP-ABE89:;-l-BDHE<=#$%>?89@AB01C()DE:FGH/()278IJK%>?89LME>?89@NOCP-ABE()PQRSTUVWNXYZ[/]Z[^_`@abcd:&'()eeefDE()TP309A1000-436X(2014)07-0038-08Forward-secureciphertext-policyattribute-basedencryptionsc

3、hemeWEIJiang-hong,LIUWen-fen,HUXue-xian(StateKeyLaboratoryofMathematicalEngineeringandAdvancedComputing,PLAInformationEngineeringUniversity,Zhengzhou450001,China)Abstract:Tomitigatethedamageofkeyexposureinthecontextofciphertext-policyattribute-basede

4、ncryption(CP-ABE).Thesyntaxandsecuritymodelofforward-secureCP-ABEwaspresented.Then,aconcretedforward-secureCP-ABEschemewasconstructed.Underthel-BDHEassumption,theproposedschemewasprovedsecureinthestan-dardmodel.Furthermore,theperformanceoftheproposed

5、schemewasdiscussedintermsofsecurityandefficiency.TheresultsdemonstratethattheproposedschemestrengthensthesecurityofCP-ABE,withoutgettingovermuchcostofcomputationandstorage,andthusismorefeasibleforpracticalapplications.Keywords:forward-secure;keyexpos

6、ure;attribute-basedencryption;provablesecurity>Ubcd)ef12Lgh]1
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7、)*+,-./012CP-ABE34`ax]yz{x134567#89:;<=2L

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9、yzk([1]FG34ASahaiHWaters2005IJK8?@34`aCD%1VW%H[3~8]!"LMABE,attribute-basedencryptionNJn0ABE+OPABEQRS!"&'TUHVWJ

10、KXY1LZ[12]^_1034`a{!l2014-06-04e2014-07-09ghijklmnoXpq973rXpstuvw(2012CB315905,2012CB315901)egxy3stuvw(2014M552524)FoundationItems:TheNationalBasicResearchProgramofChina(973Program)(2012CB315905,2012CB315901);ChinaPost