Oneofthemostwidelyusedblockcipheralgorithmsis
theDataEncryptionStandard(DES),adoptedin1977
bytheAmericanNationalStandardsInstitute(ANSI).
Aftermorethantwentyyearsofusewithcontinuous
agingduetoadvancesincryptography,theNational
InstituteofStandardsandTechnology(NIST)onSep-
tember12,1997,startedaprocesstostimulatethe
developmentandsubmissionofalternativestothe
DES.Twenty-onealgorithmswereanalyzedinthefirst
roundandfivealgorithmswereanalyzedinthesecond
round.OnOctober2,2000theNISTannouncedthat
thenewencryptiontechnique,namedAdvanced
EncryptionStandard(AES),wouldusetheRijndael
algorithm,designedbytwowell-knownspecialists,
JoanDaemenandVincentRijmenfromBelgium.The
newAESwillbeusedtoprotectsensitiveinformationof
federalcomputersystems,aswellasmanyprivate
businesses.AN821AdvancedEncryptionStandardUsingthePIC16XXXFUNDAMENTALENCRYPTIONAuthor:CaioGubelOVERVIEWMicrochipTechnologyInc.Throughouthistory,mankindhasfacedtheproblemofstoringandtransmittingsensitiveinformationinawaythatcouldguaranteebothreliableandeasyaccesstoINTRODUCTIONauthorizedpersonsandpreventundueandillegal
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