| Subject | English | Portuguese |
| IT, transp. | authentication of messages | autenticação de mensagens |
| IT, transp. | message authentication | autenticação de mensagens |
| commun. | Message Authentication Code | código de autentificação de mensagem |
| comp., MS, Braz. | Message Authentication Code | Message Authentication Code (An algorithm that allows a receiver to ensure that a block of data has retained its integrity from the time it was sent until the time it was received) |
| commun., IT | message origin authentication | autenticação da origem da mensagem |