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Zone Working Key PIN encryption between banks

HSM & Security

What Is ZWK (Zone Working Key)?

ZWK stands for Zone Working Key. It encrypts the PIN so that it can travel securely between different financial institutions, such as the acquiring bank and the issuing bank.

Logo and branding of BKM, Turkey's Interbank Card Center

Payment Systems

What is BKM (Interbank Card Center)?

BKM, short for Interbank Card Center, is a legal entity established in 1990 with contributions from 13 public and private Turkish banks to provide clearing and settlement for cards.

Amazon Web Services cloud computing illustration

Security

Why Is AWS (Amazon Web Services) Preferred?

The number of companies offering cloud computing and storage has grown sharply in recent years. AWS, founded in 2006, is the world's largest cloud computing and storage provider, ahead of Google Cloud, Microsoft Azure and IBM.

BKM Express digital wallet screen

E-commerce

Will BKM Express Continue to Exist?

BKM Express has pioneered card storage and digital wallets in Turkey. After the Competition Authority's termination decision, a Board decision revoked it, so BKM Express will continue. Here is the latest situation.

ATM machine with cash dispenser and receipt printer

ATM

What Is an ATM?

ATM stands for Automated Teller Machine, an electronic device that lets customers carry out account transactions with or without a card. It was invented in 1960 by John Shepherd-Barron. The first ATM in Turkey was installed in 1982.

Diagram of PIN Encryption Key (PEK) structure

HSM & Security

What is PEK (Pin Encryption Key)?

PEK is the abbreviation for Pin Encryption Key. The role of PEK is to encrypt PINs. There are two types of PEK: TPK (Terminal Pin Key) and ZWK (Zone Working Key).

Diagram illustrating the properties and lifecycle of a tokenized card number as it moves through the payment network

HCE

What Are the Characteristics of a Tokenized Card Number?

A tokenized card number replaces a physical card number so transactions can be carried out securely. It is generated by the TSP (Token Service Provider), used by the cardholder or merchant, and travels across the payment systems network.

Illustration of ways merchants can reduce chargebacks on card transactions

Chargeback

How to Reduce Chargebacks (For Merchants)

Chargeback is inherent to card transactions, so it may be impossible to prevent entirely, but taking precautions keeps the risk to a minimum. Here are the key points merchants should pay attention to in order to reduce chargebacks.

Diagram showing different types of POS terminals used for card payments

Merchant & POS

What Is a POS (Point of Sale)?

Virtual or electronic authorization devices connected to a bank, used by merchants to accept card payments. The term comes from the English phrase Point of Sale. Covers POS types by communication method, their advantages, who can use one, and the transactions a POS can perform.

Diagram illustrating White Box Cryptography (WBC) for securing open devices

HSM & Security

What is White Box Cryptography (WBC)?

White Box Cryptography (WBC) is an important technology used to minimize security risks for open devices such as smartphones. It is a new technique against attacks targeting white-box attack environments.

Secure card storage and tokenization illustration

Merchant & POS

What Is Card Storage?

Card storage is a system, secured with PCI DSS certification, for storing credit and debit card details safely. It saves consumers from entering their card details again and again on frequent purchases.