keep your data secure with the new advanced encryption standard

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1、■C:AESAe^DemoCon»olebinDebuQAe^DemoC〇€ift〇le^HeENCRYPTITKeepYourDataSecurewiththeNewAdvancedEncryptionStandardJamesMcCaffreyThisarticleassumesyou'refamiliarwithC#andbitmanipulationLevelofDiffiult123Downloadthecodeforthisarticle:AES.exe(143KB)SUMMARYTheAdvancedEncryptionStandard(AE

2、S)isaNationalInstituteofStandardsandTechnologyspecificationfortheencryptionofelectronicdata.Itisexpectedtobecometheacceptedmeansofencryptingdigitalinformation,includingfinancial,telecommunications,andgovernmentdata.ThisarticlepresentsanoverviewofAESandexplainsthealgorithmsituses.Includ

3、edisacompleteC#implementationandexamplesofencrypting.NETdata.AfterreadingthisarticleyouwillbeabletoencryptdatausingAES,testAES-basedsoftware,anduseAESencryptioninyoursystems.heNationalInstituteofStandardsandTechnology(NIST)establishedthenewAdvancedEncryptionStandard(AES)specificationon

4、May26,2002.InthisarticleIwillprovideaworkingimplementationofAESwritteninC#,andacompleteexplanationofexactlywhatAESisandhowthecodeworks.I'llshowyouhowtoencryptdatausingAESandextendthecodegivenheretodevelopacommercial-qualityAESclass.I'llalsoexplainhowandwhytoincorporateAESencryptioninto

5、yoursoftwaresystems,andhowtotestAES-basedsoftware.NotethatthecodepresentedinthisarticleandanyotherimplementationbasedonthisarticleissubjecttoapplicableFederalcryptographicmoduleexportcontrols(seeCommercialEncryptionExportControlsfortheexactregulations).AESisanewcryptographicalgorithmth

6、atcanbeusedtoprotectelectronicdata.Specifically,AESisaniterative,symmetric-keyblockcipherthatcanusekeysof128,192,and256bits,andencryptsanddecryptsdatainblocksof128bits(16bytes).Unlikepublic-keyciphers,whichuseapairofkeys,symmetric-keyciphersusethesamekeytoencryptanddecryptdata.Encrypte

7、ddatareturnedbyblockciphershavethesamenumberofbitsthattheinputdatahad.Iterativeciphersusealoopstructurethatrepeatedlyperformspermutationsandsubstitutionsoftheinputdata.Figure1showsAESinactionencryptingandthendecryptinga16-byteblockofdatausinga192-bitkey.■C:AESAe^DemoCon»olebinDeb