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| CVV | Card Verification Value (Visa) |
|---|---|
| DATA | Data to be encrypted etc. Always a multiple of 8 bytes |
| DES | Data Encryption Standard |
| DPK | Data Protect Key. Usually a random generated session key (KS) |
| DUKPT | Derived Unique Key Per Transaction |
| EMV | Europay, MasterCard and Visa. Technical standard for smart payment cards. |
EFT | Electronic Funds Transfer |
EFT Client | A specialized EFT payments application running on a payment device |
| IPEK | Initial PIN Encryption Key |
| Function Code | The function code is always the first field in all response and request messages. This |
GUI | Graphical User Interface |
HAL | Hardware Abstraction Layer |
hEFT | headstart EFT simplification layer for 3rd party EFT Client applications/devices |
| HMAC-SHA-1 | Message authentication algorithm using SHA-1 hash |
| HSM | Hardware Security Module |
iOS | The iPhone operating system |
ePOS | Electronic Point Of Sale software application |
| KCV | Key Check Value. |
| KEK | Key Exchange Key (MasterCard). |
| KGK | Key Generation Key |
| MSC | Magnetic Stripe Card |
| MSR | Magnetic Stripe Reader |
mPED | A mobile PED |
OS | Operating System |
| PAN | The customer Primary Account Number. |
| PIN | The Personal Id Number. It may be formatted in several ways depending on the |
| PPK | PIN Protect Key |
| PVK | The PIN Verification Key may be used for PIN protection as well as for PIN |
PCI | Payment Card Industry, regulations exposed on the PCI web site |
PED | PIN Entry Device, a hardware device accepting credit cards and verifying PIN validity |
POS | Point Of Sale application/device |
| PVKI | PIN Verification Key Indicator (Visa). |
| PVN | PIN Verification Number |
| PVS | PIN Verification Service (Visa). |
| PVV | PIN Verification Value (Visa). |
| RC | Return Code The second field in all response messages. If this field is non-zero then an error is |
| RKI | Remote Key Injection |
| RND | Random Number |
| SECURE KEY BLOCK | Structured block based on a collaborative industry standard (e.g. TR-31, GISKE) to |
| SK | Secret Key |
| SMID | Security Management Information Data |
| SSK | Shared Secret Key |
| TDES | Also referred to as 3DES, a mode of the DES encryption algorithm that encrypts data |
| TK | Terminal Key |
| TRSM | Tamper Resistant Security Module |
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