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1、附录外文原文及翻译KeepYourDataSecurewiththeNewAdvancedEncryptionStandardJamesMcCaffreySUMMARYTheAdvancedEncryptionStandard(AES)isaNationalInstituteofStandardsandTechnologyspecificationfortheencryptionofelectronicdata.Itisexpectedtobecometheacceptedmeansofencryptingdigitalinformation,includingfinancial,tel
2、ecommunications,andgovernmentdata.ThisarticlepresentsanoverviewofAESandexplainsthealgorithmsituses..AfterreadingthisarticleyouwillbeabletoencryptdatausingAES,testAES-basedsoftware,anduseAESencryptioninyoursystems.Notethatthecodepresentedinthisarticleandanyotherimplementationbasedonthisarticleissu
3、bjecttoapplicableFederalcryptographicmoduleexportcontrols(seeCommercialEncryptionExportControlsfortheexactregulations).AESisanewcryptographicalgorithmthatcanbeusedtoprotectelectronicdata.Specifically,AESisaniterative,symmetric-keyblockcipherthatcanusekeysof128,192,and256bits,andencryptsanddecrypt
4、sdatainblocksof128bits(16bytes).Unlikepublic-keyciphers,whichuseapairofkeys,symmetric-keyciphersusethesamekeytoencryptanddecryptdata.Encrypteddatareturnedbyblockciphershavethesamenumberofbitsthattheinputdatahad.Iterativeciphersusealoopstructurethatrepeatedlyperformspermutationsandsubstitutionsoft
5、heinputdata.Figure1showsAESinactionencryptingandthendecryptinga16-byteblockofdatausinga192-bitkey.Figure1SomeDataAESisthesuccessortotheolderDataEncryptionStandard(DES).DESwasapprovedasaFederalstandardin1977andremainedviableuntil1998whenacombinationofadvancesinhardware,software,andcryptanalysisthe
6、oryallowedaDES-encryptedmessagetobedecryptedin56hours.SincethattimenumerousothersuccessfulattacksonDES-encrypteddatahavebeenmadeandDESisnowconsideredpastitsusefullifetime.西安工业大学毕业设计(论文)Inlate1999,theRijndael(pronounced"raindoll")algorithm,createdbyresearchersJoanDaemenandVincentRijmen,wasselected
7、bytheNISTastheproposalthatbestmetthedesigncriteriaofsecurity,implementationefficiency,versatility,andsimplicity.AlthoughthetermsAESandRijndaelaresometimesusedinterchangeably,theyaredistinct.AESiswidelyexpectedtobecomet
