简介：Intoday'sInternetcomputingworld,illegalactivitiesbycrackersposeaseriousthreattocomputersecurity.Itiswellknownthatcomputerviruses,Trojanhorsesandotherintrusiveprogramsmaycausesevereandoftencatastrophicconsequences.Thispaperproposesanovelsecurecomputerarchitecturebasedonsecurity-code.Everyinstruction/datawordisaddedwithasecurity-codedenotingitssecuritylevel.Externalprogramsanddataareautomaticallyaddedwithsecurity-codebyhardwarewhenenteringacomputersystem.Instructionwithlowersecurity-codecannotrunorprocessinstruction/datawithhighersecuritylevel.Security-codecannotbemodifiedbynormalinstruction.Withminorhardwareoverhead,thenewarchitecturecaneffectivelyprotectthemaincomputersystemfromdestructionortheftbyintrusiveprogramssuchascomputerviruses.FormostPCsystems,itincludesanincreaseofword-lengthby1bitonregisters,thememoryandtheharddisk.
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