| Accronym | Abbrevation |
| 3DES | Triple Data Encryption Standard |
| AES | Advanced Encryption Standard |
| AWK | Acquirer Working Key |
| CDA | Combined Data Authentication |
| CMK | Control Master Key |
| CVK | Card verification key |
| CVV | Card verification Value |
| DCE | Data Communication equipment |
| DDA | Dynamic Data Authentication |
| DES | Data Encryption standard |
| DL | Double Length |
| EFPTOS | Electronic fund transfer at POS |
| ENC | Visa issuer Master Encryption Key |
| IMKac | Master card Issuer Master Key for the generation of AC generation |
| IMKdac | Master card Issuer Master Key for the generation of data Authentication code |
| IMKmac | Master card Issuer Master Key for the generation of Message Authentication Code |
| IMKsmc | Master card Issuer Master Key for the generation of Secure Message confidentiality |
| IMKsmi | Master card Issuer Master Key for the generation of Secure messaging Integrity |
| IWK | Issuer Working Key |
| KCL | Key Compromise List |
| KCV | Key check Value |
| KMKmac | Card unique key derived from IMKmac |
| LMK | Local Master Key |
| MAC | Visa Issuer Message Authentication Code |
| MDK | Visa Issuer Master Derivation Key |
| MDK enc | Issuer Master encryption key for script commands |
| MDK mac | Issuer master MAC key for script commands |
| MDKac | Issuer Master Key for AC generation |
| MKsmc | Card unique key derived from IMKsmc |
| P1 | Public Keys |
| PAN | Primary Account Number |
| PEK | PIN Encipherment Key |
| PIN | Personal Identification Number |
| PROM | Programmable Read only memory |
| PVK | PIN Verification Key |
| PVKI | PIN Verification Key Indicator |
| PVV | PIN Verification Value |
| RSA | Rivest Shamir Adleman (public key cryptography algorithm) |
| S1 | Private key sets |
| SA | Service Agents |
| SDK | Software Development Kit |
| SDA | Static Data Authentication |
| TAK | Terminal Authentication Key |
| TCP | Transport control Protocol |
| TDK | Terminal Derivation Key |
| TEK | Terminal Encryption Key |
| TMK | Terminal Master Key |
| TPK | Terminal PIN Key |
| UDK | card unique key derived from MDK |
| UDK mac | Card unique derived from MAC |
| UDKenc | Card Unique key derived from ENC |
| VSDC | Visa Smart Debit Credit |
| WK | Working Key |
| WWK | Watch World Key |
| X’NN | A 2 Digit Hexadecimal value , used to represent one byte |
| ZAK | Zone authentication Key |
| ZCMK | Zone control Master Key |
| ZEK | Zone encryption Key |
| ZMK | Zone Master Key |
| ZPK | Zone Pin Key |
| ZTK | Zone Transport Key |
