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ATM machine targeted by jackpotting attacks

ATM

ATM Hacking Attacks Are on the Rise!

ATMs hold large amounts of cash, which keeps them in fraudsters' sights. Diebold Nixdorf and NCR report that jackpotting attacks have reached the United States. Here is what happened and what precautions can improve ATM security.

Diagram illustrating Terminal PIN Key (TPK) usage in POS and ATM devices

HSM & Security

What is TPK (Terminal PIN Key)?

TPK stands for Terminal PIN Key. It is a data encryption key used to encrypt PINs for transmission between a terminal and the terminal's bank (acquirer) within a local network. Learn how TPK is used in POS and ATM devices.

Illustration of a Terminal Master Key (TMK) securing a payment terminal

HSM & Security

What is TMK (Terminal Master Key)?

TMK stands for Terminal Master Key, a key-encrypting key distributed manually or automatically under a previously established TMK. It is used to distribute data encryption keys to an ATM or POS terminal within a local network.

Logos of various international payment card schemes

Credit Card

What Are National and International Payment Schemes?

In the world of payment systems, just as credit cards are an indispensable product, a payment scheme is indispensable for credit cards. When a credit card product is launched, the scheme it will be issued under is decided first.

Diagram explaining the ATM reject bin where unaccepted banknotes are deposited

ATM

What Is Reject (the Reject Bin)?

It's a term used in ATM systems within payment systems. In ATM transactions, cash in question is placed into a separate compartment for review, called the reject bin. Retract is the customer's holding bin; reject is the ATM's reject bin.

Illustration representing credit card fraud and online payment security risks

Fraud

What is Fraud? What are the Types of Fraud?

With the growth of credit and debit card usage and rising e-commerce transaction volumes, there has been a serious increase in exploiting user negligence to harm customers. Fraud means using someone else's card at a merchant or ATM to gain unjust profit.

Payment systems in Türkiye overview

Payment Systems

What Are the Payment Systems in Türkiye?

When we hear “payment systems”, card transactions at POS terminals or ATMs usually come to mind. Let's look together at the payment systems recognized by the Central Bank.

Illustration explaining the concept of the first online transaction after a card PIN change

Merchant & POS

What Does First Online Transaction Mean?

In payment systems, an online transaction means the transaction is sent to the card or POS/ATM bank at the moment it occurs, and required checks are obtained from that system. So does every transaction happen online? Of course not. Especially with contactless...

ATM cash dispenser mechanism distributing banknotes

ATM

What Are the Cash Dispensing Algorithms Used in ATMs?

ATMs are important transaction points that let customers handle financial transactions without visiting a bank branch. 24/7 availability matters for customer satisfaction, so banks take steps to reduce both operational and cash costs.

Close-up photo of a cracked payment card

Credit Card

My Card Is Broken. What Should I Do?

If your card is broken, call your bank's Customer Contact Center to request a renewal. Since the card number usually stays the same after renewal, this is convenient for you. If you'll keep using the card, don't set it to Closed or Cancelled status.

Illustration of an ATM cash dispenser showing the retract and reject cash compartments

ATM

What Is Retract?

Retract is a term used in ATM systems. When cash already presented to the customer is not taken, it is diverted into a compartment called retract, as opposed to the reject compartment used for unusable banknotes.