Back رمز مصادقة رسالة Arabic Message authentication code AST Codi d'autenticació de missatge Catalan Message authentication code Czech Message authentication code Danish Message Authentication Code German Κωδικός Αυθεντικοποίησης Μηνύματος Greek Código de autenticación de mensaje Spanish کد اصالتسنجی پیام Persian Viestin todennuskoodi Finnish
In cryptography, a message authentication code (MAC), sometimes known as an authentication tag, is a short piece of information used for authenticating and integrity-checking a message. In other words, it is used to confirm that the message came from the stated sender (its authenticity) and has not been changed (its integrity). The MAC value allows verifiers (who also possess a secret key) to detect any changes to the message content.