软件水印算法研究

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1、武汉理工大学硕士学位论文软件水印算法研究姓名：李君申请学位级别：硕士专业：通信与信息系统指导教师：刘泉20100301AbstractTheglobalfinancialcrisiseruptedin2008hascausedgreateconomics1oIVdoVImandrecession.Butthesoftwareindustrysti1lkeepssteadyandrapidgrowth,whichhasp1ayedanactiveroleinthenationa1economyandsoci

2、etyinformatization.Atthesametime,thephenomenonofi1legalcopyandpiracyforsoftwarehasbecomeastumblingblocktothevigorousdevelopmentofthesoftwareindustry,andinfluencedtheprotectionofthesoftwareintellectualpropertyseriously.Thus,thesoftwarewatermarkingbasedonth

3、etechnologyofsoftwareprotectionhasemergedasthetimesrequire.Throughtheestablishmentofeffectivereal—timeinspectionandduplicatecheckingmechanism,theillegalcopyandspreadofsoftware.Canbecontainedtoacerta1nextentbyaoftwa.rewater.marrFking.,—,..Basedontneanalys1

4、softnecu°rrents1tuatlonofdomest1candforeignsoftwarewatermarking,twokindsofsoftwarewatermarkingalgorithmsandawatermarkingdetectingschemehavebeenstudiedanddesignedinthispaper,whicha11havegoodfeaturesoninvisibi1ityandrobF•1rst1y，akindofimprovedsoftwarewatcrm

5、arkinga1gorithmSCC(se1ectedCo10rChanging)onregisterassignmentgraphcoloringhasbeenpresented•Thewatermark•1ngb•1naryisembeddedbyusingtheprincip1eofreg•1stera110cat10n9c0nstruct1ngthegraphc010ringmode1andfimctionandchang•1ngthenodesc010rsintheinterferegraPh.

6、Accordingtothedifferentnumbersbetweenlhewatermark1ngb■1narVOandT9thec0rresPondingco1or■1ng:strategyisse1e?ctedwh•1chcan•1mpr0Vetheembedd•1ngefficienc:yand10WerthealysisofSCCalg§fifl°aStrhfeoUPnfftorithmiscomp1etedandmecbaractcristicsaboutrcsistancc,stealt

7、h,data—rate,cfficicncyandcostareelaborated.Thesoftwarewatermarkingalgorithmba「sedonHashfunctionSHA—512i.sakindordynamicwatermarking・Whcnsclcctlnglhcinlcgcrconstantsrandomlyintherunningtrackoftheprogramandobtainingthemessagedigestusingthelatestsafetystanda

8、rdSHA・512,thelogicalrelationshipbetweenwatermarkmessageandintegerconstantsissetup・Thcsclectedintegcrconstantsarercplaccdbythecal1functionw11ichisconstructed,SOthewatermarkingisembeddeddynamical1y.Itishiddeninthecal1