NFC stands for Near Field Communication and is used to communicate over short distances. At the end I show you how to reprogram a vending machine’s NFC tag to contain more credits. ![]() In this blog post I will cover some quick basics about NFC, Mifare Classic and how to set up everything for reading and writing a NFC tag. Mifare Classic in general is stated insecure, because it’s encryption protocol has been cracked. There are also other types like the “Mifare Classic 4k” and the “Mifare Mini” each having a different memory size. The Proxmark is the tool behind all major RFID Security Research breakthroughs: Mifare Classic Crypto cracking, Mifare PRNG analysis, VingCard exploitation & defeat to name a few.
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