一種基于控制流平整的代碼混淆算法研究與實現(xiàn)

1、西北大學碩士學位論文一種基于控制流平整的代碼混淆算法研究與實現(xiàn)姓名：杭繼春申請學位級別：碩士專業(yè)：計算機應用技術指導教師：房鼎益20100609AbstractSoftwareprotectiontechniqueagainstmalicioushostisoneofthemajorbranchesinthecomputersecurityfieldItcontainshardware—basedprotectionmethodsand

2、sofhvarebasedprotectionmethodsCodeobfuscationwhichisaneffectiveandpracticalsoftware—basedprotectiontechniquetransformstheprogramcodesundertheconditionofpreservingsemanticsCrackercan’tgetvaluableinformationfromobfuscatedp

3、rogramwhichhaspoorreadability，SOtheobjectsofsoftwareprotectionandpiracypreventioncanbeachievedCurrentlytheresearchofcodeobfuscationmostlyhasbeenfocusedonthecontrolobfuscationanddataobfuscationThetransformationsofcontrolo

4、bfuscationanddataobfuscationhavestrongpotencyandresiliencebutmeyleadtoincreasingcostintimeandspaceaswellAnewcontrolflowflatteningobfuscationalgorithmisproposed，whichCanincreasethecomplexityandabilitytesistattackingfromcr

5、ackerandmaketheexecutioncostinaproperlevel，SOthisobfuscationalgorithmachieveabalancebetweenobfuscationpotencyandexecutioncostAC學sourcecodeobfuscatorisdesignedandimplementedinthispaperThemainworkofthispaperisasfollowing：1

6、Existingcontrolflowflatteningobfuscationalgorithmshaveaseriousdefectthatisoverloadingperformance麗thhighobfuscationpotencySOimprovementsagainstthisdefectismadeinthispaperImprovedalgorithmwhichemploysrandomlyobfuscationtec

7、hniquestoachievediversityofobfuscationobservablyraisestheobfuscationpotencyofexistingcontrolflowflatteningobfuscationalgorithmsFurthermore，improvedalgorithmwhichrealizesthecombinationofobfuscationpotencyandexecutioncostt

8、hroughcontrollingobfuscationdepth，guaranteeshighobfuscationpotencywitlllowerexecutioncost2AC樣SOurcecodeobfuscatorCFFO(ControlFlowFlatteningObfuscator)isdesignedandimplementedThedesignobject，systemstructureandworkflowofth