---
id: 4438
title: "RFID: Monotonic Counter Anti-Tearing Defeated"
source_domain: blog.quarkslab.com
source_url: "https://blog.quarkslab.com/rfid-monotonic-counter-anti-tearing-defeated.html"
published_at: "2021-05-17T22:00:00Z"
tags: ["hardware-security", "rfid", "nfc", "proxmark3", "mifare", "tear-off"]
phying_url: "https://phying.com/item/4438"
lang: en
---

# RFID: Monotonic Counter Anti-Tearing Defeated

## Summary

Using Proxmark3 tear-off techniques, Quarkslab defeated the anti-tearing monotonic counters in NXP MIFARE Ultralight EV1 and NFC cards, disclosing the issue to NXP which published mitigations.

## Intelligence Metadata

- **Sources:** blog.quarkslab.com
- **Published:** 2021-05-17T22:00:00Z
- **Original:** https://blog.quarkslab.com/rfid-monotonic-counter-anti-tearing-defeated.html
- **Phying News:** https://phying.com/item/4438