: Uses algorithms (like DES/TDES) to encrypt transaction data, producing an 8-byte ARQC for online authorization.
However, there is a catch that often trips up fraudsters: To generate a valid ARQC, the software requires the Issuer Master Key (IMK) . This key is the crown jewel of a bank's security. It is never stored on the card and is rarely compromised. Without this specific key, ARQCGenerate.exe cannot produce a cryptogram that the bank will accept. arqcgenexe