ISOIEC9797-2-2021isaninternationalstandardthatspecifiesamessageauthenticationcode(MAC)algorithmusingablockcipher.ItispartoftheISO/IEC9797series,whichprovidesmethodsfordataintegrityandauthentication.ThestandarddefinesMACalgorithmsthatuseasymmetrickeyblockciphertoproduceafixed-sizeoutput,ensuringtheauthenticityandintegrityofamessage.Itiswidelyusedincryptographicapplicationswheresecuredatatransmissionandverificationarerequired.The2021versionincludesupdatesandimprovementstoenhancesecurityandalignwithcurrentcryptographicbestpractices.Thisstandardisessentialforindustriesrequiringsecurecommunication,suchasfinance,telecommunications,anddataprotection,ensuringthatmessagesremaintamper-proofandverifiable.
