Aac

AAC (Application Authentication Cryptogram) and ARQC (Authorization Request Cryptogram) are both types of Application Cryptograms (ACs) in EMV systems, serving as Message Authentication Codes (MACs) to ensure transaction integrity and authenticity. They are generated by the chip card using...

Overview of AAC Generation Process The Application Authentication Cryptogram (AAC) is an 8-byte cryptographic value generated by an EMV chip card to indicate that a transaction has been declined, either offline or after an online authorization attempt. It serves as a Message Authentication Code...