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1、ACRYPTANALYSISOFTHETINYENCRYPTIONALGORITHMbyVIKRAMREDDYANDEMATHESISSubmittedinpartialfulfillmentoftherequirementsforthedegreeofMasterofScienceintheDepartmentofComputerScienceintheGraduateSchoolofTheUniversityofAlabamaTUSCALOOSA,ALABAMA2003SubmittedbyVikramReddyAndeminpartialfulfillmentofth
2、erequirementsforthedegreeofMasterofSciencespecializinginComputerScience.AcceptedonbehalfoftheFacultyoftheGraduateSchoolbythethesiscommittee:______________________KennethG.Ricks,Ph.D.______________________SibabrataRay,Ph.D.______________________RandyK.Smith,Ph.D.______________________Philli
3、pG.Bradford,Ph.D.Chairperson______________________DavidW.Cordes,Ph.D.DepartmentChairperson__________________Date______________________RonaldW.Rogers,Ph.D.DeanoftheGraduateSchool__________________DateiiACKNOWLEDGMENTSItisdifficulttooverstatemygratitudetomyadvisor,Dr.PhillipBradford.Withhise
4、nthusiasm,hisinspiration,andhisgreateffortstoexplainthingsclearlyandsimply,hehelpedtomakecryptographyfunforme.Throughoutmythesiswritingperiod,heprovidedencouragement,soundadvice,goodteaching,goodcompany,andlotsofgoodideas.Iwouldhavebeenlostwithouthim.IamveryfortunatetohaveDr.RandySmithandD
5、r.SibabrataRayonmythesiscommittee.Theirguidanceandfeedbackwerecrucialtomywork.IwanttothankDr.KennethRicksforservingonmythesiscommittee,andforprovidingvaluablefeedback.Lastandmostimportantly,Iwishtothankmyparents,VenkatReddyAndemandVasanthaReddyAndem.Theyboreme,raisedme,supportedme,taughtme
6、,andlovedme.iiiCONTENTSACKNOWLEDGMENTS……………………………………………………..…………iiiLISTOFFIGURES………………………………………………………………….…...viABSTRACT………………………………………………………………………….....viii1INTRODUCTION…………………………………………………………………..11.1Motivation…………………………………………………………………...….11.2Stateoftheart……………………………………………………..………...….11
7、.3Preliminaries…………………………………………………………………….21.4ResearchStudy……………………………………………………………….….31.5OrganizationoftheThesis……………………………………...........................32MOTIVATIONFORRESEARCH……………………………………………….…42.1Background………………………………………………………………..…….42.2TinyEncryptionAl
