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1、LaboratoryTwo–DecodingLab(Part1)Objectives:Forthisexercise,youhavetocompileaprogramasattachedandsupplyfoursecretkeystodeterminethecontents.Inthislaboratory,youhavetosupplythefirsttwo.Theremainingwillbedonenextweek.Iwillguideyoutosolvetheproblem.Thisexerciseisextracte
2、dfromtheCTE,SSD6–Exerciseone.Thedetailsareasfollows.Starttheprogram:1)invokethevisualC++andusenewtostarttheworkplace.2)SelecttheNewMenuandclick“workplace”.Thenameiscalledexercise13)Theprojectisexercise1:SelectWin32Console121)Theoutputafterselectingtheprojectisasfollo
3、ws.2)Selecttheemptybuttonuntilyouseethefollowingscreen3)NowSelectNewagainandthenFiles,typethenameoffile“Exercise1”andselectC++sourcefile.121)Clickthefileviewandthesourcefilesyouwillseeexercise1.cppisthere,butisempty.2)Nowyoudownloadthesecretfile(secret.cpp)fromCTEweb
4、siteorgetitfromappendix.121)Compiletheprogramwithoutanybug.Setabreakpoint:Setabreakpointtoforcetheprogramtobreak,pressF9.Agoodprogrammermustknowhowtodebug.1)PressF9atthelocationofintdummyundermain()2)NowClickDebugandchoosestartdebugthengo,youwillseethescreen12Itmeans
5、theprogramstopsatthislocation,Youcannowdummythemessagetoanalysisthedata.1)Rightclickyourmouseandyouwillgetascreenasfollows:2)Selectquickwatchandyouwillseeaquickwatch121)TypethedataandwritetheaddressAddressofdatais:_______0x00424ab0______(hint:inhex,ox……..)2)Intheaddr
6、essscreen:Enterthevalueoftheaddressofdata:0x00424ab0__________.Youcanseethevalueofontherighthandside.12Writedownthefirst40characters.cccccccccFFrromo:mFr:iendCTTo：EYouTDeterminethevalueofstartandstride:[Hint]Nowyoufindthatifyoucanextractthemessage,pickthestartmessage
7、andthenthestride(afterhowmanycharactersforthenext),youcanthenguesshowtodetermineit.Forexample,1234567890AStart:0andstride:2,willproduce13579AStart:0andstride:3,willproduce1245780AStart:0andstride:4,willproduce12356790AStart:1andstride:3,willproduce235689AIfyouchooset
8、hevalueproperly,youwillget:Startvalue:indecimalinordertoproducetheabovemessageis___9____12Stride:lengthofnextcharacter(Hint:Youhave
