General Abbreviations

ATKS

 Australian Transaction Key Scheme.

ATM

 Automated Teller Machine.

AWK

 Acquirer Working Key.

BDK

 Base Derivation Key.

CVK

 Card Verification Key.

CVV

 Card Verification Value.

DCE

 Data Communications Equipment.

DEA

 Data Encryption Algorithm, used by DES.

DES

 Data Encryption Standard.

DTE

 Data Terminal Equipment.

DUKPT

 Derived Unique Key per Transaction.

EFTPOS

 Electronic Funds Transfer at Point of Sale.

FPGA

 Field Programmable Gate Array

IV

 Initialisation Vector 

IWK

 Issuer Working Key.

KCV

 Key Check Value.

LMK

 Local Master Key.

MAC

 Message Authentication Code.

OAEP

 Optimal Asymmetric Encryption Padding.

OWF

 One-Way Function.

PAN

 Primary Account Number.

PEK

 PIN Encrypting Key.

PIN

 Personal Identification Number.

PVK

 PIN Verification Key.

PVKI

 PIN Verification Key Indicator.

PVV

 PIN Verification Value.

RAM

 Random Access Memory.

RSA

 Rivest, Shamir and Adleman public key scheme.

RTC

 Real Time Clock

RTKS

 Racal Transaction Key Scheme.

TAK

 Terminal Authentication Key.

TDK

 Terminal Derivation Key.

TCP

 Transport Control Protocol.

TEK

 Terminal Encryption Key.

TMK

 Terminal Master Key.

TPK

 Terminal PIN Key.

WK

Working Key. 

WWK

Watchword Key.

X'NN

A 2-digit hexadecimal value, often used to represent a 1-byte value.

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.