How do electromagnetic chips like those on cards exactly work and direct EMVs coming from the reader?

Question

I know they communicate and am not exactly interested in the description of the transaction itself – rather, the enguneering and physica behind it.

In: 2

Answer 1

You mean like a contactless payment? It’s an NFC chip, a form of RFID, where the antenna in the card receives power from the antenna from the reader, which powers the chip in the card, allows it to solve a cryptographic puzzle which proves that the chip is genuine, and gives the answer back to the reader over the same wireless connection.