EMV chip cards use cryptographic transaction processing to help reduce counterfeit payment fraud. A routine read does not reveal secret authentication keys, and a magnetic-stripe writer does not program the EMV chip.
What Are EMV Chip Cards?
EMV chip cards are credit or debit cards that use a small, built-in computer chip for secure transactions. Unlike traditional magnetic stripe cards, which store unchanging data, EMV chip cards generate a unique transaction code for every purchase. This added layer of security helps protect against fraud and makes it harder for criminals to copy card information.
What Does EMV Stand For?
EMV stands for Europay, Mastercard, and Visa, the three companies that developed the global standard for chip cards. EMV technology is now widely used worldwide to authenticate and secure payments made with chip-enabled cards.
How Do EMV Card Readers Work?
EMV card readers work by reading the information stored on the chip embedded in the card.
To complete a transaction, the card is "dipped" into the reader slot and left there for a few seconds while the card and the reader communicate.
During this time, the chip generates a unique code that verifies the card’s authenticity. Some EMV chip cards can also be tapped against a contactless reader, using NFC (Near Field Communication) technology for even faster payments.
Are EMV Chip Card Payments Secure?
Yes, EMV chip card payments are more secure than traditional magnetic stripe payments.
The chip technology makes it harder for criminals to duplicate card information.
Unlike magnetic stripe cards, which store static data, EMV chip cards generate a new, unique transaction code each time they are used, making it much more difficult for counterfeiters to replicate.
How Do EMV Chips Protect Against Fraud?
EMV chip transactions use dynamic cryptographic data to reduce counterfeit-card fraud. Captured static card data does not reproduce the chip’s transaction authentication.
EMV does not prevent every form of fraud. The issuer and payment system still apply authorization and other controls; EMVCo’s contact-chip overview explains the technology.
What Types of EMV Chip Cards Are There?
There are two main types of EMV chip cards: contact and contactless.
- Contact EMV cards require you to insert or "dip" the card into the reader.
- Contactless EMV cards allow you to tap the card near a contactless reader using NFC technology.
Some cards offer both options, making them more convenient for users in different payment situations.
Contactless payments are faster and becoming more popular in places like the U.S., as many retailers are now moving towards dual-interface systems that accept both types of EMV chip cards.
How To Read & Write Data on EMV Chip?
An EMV payment terminal exchanges application data with the chip and uses cryptographic responses during payment processing. A routine read does not return the chip’s secret authentication keys.
EMVCo’s security guide explains how the card authenticates transaction data without sharing secret keys with the terminal.
A magnetic-stripe reader/writer works on the stripe, not the EMV chip. Rewriting stripe data does not personalize the chip, change an issuer’s account balance or provide payment authorization.
Chip personalization and supported issuer updates require the issuer’s authorized process and credentials. An ordinary user cannot turn a blank card into a working bank card by copying readable records.
