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+# Near Field Communication (NFC)
+
+### Replay Attacks
+Replay attack is a technique where a malicious user could implement a device to intercept a NFC transaction and redeem it later, using other device or even in different location. 
+
+### Relay Attack
+The relay attack is a technique where a malicious user implements a man in the middle attack. The attacker(APDUer) is capable to intercept, manipulate and change the transaction in real time to take advantage of it.  
+[https://en.wikipedia.org/wiki/Relay_attack](https://en.wikipedia.org/wiki/Relay_attack)
+
+### Intro to NFC Payment Relay Attacks
+[https://salmg.net/2018/12/01/intro-to-nfc-payment-relay-attacks/](https://salmg.net/2018/12/01/intro-to-nfc-payment-relay-attacks/)
+
+### NFCopy85 is a 10 dollars device to make replay attacks against NFC payment systems
+
+[https://salmg.net/2019/06/16/nfcopy85/](https://salmg.net/2019/06/16/nfcopy85/)