Select "Write Dump" on the "destination" card, ensuring you have the correct keys for the destination card. Security Implications and Ethical Use
MIFARE Classic Tool (MCT) is a powerful Android application designed for reading, writing, and analyzing MIFARE Classic RFID tags. Version 2.3.1 stands as a highly stable, widely used release of this open-source utility. It allows security researchers, penetration testers, and RFID enthusiasts to interact directly with 13.56 MHz contactless chips using an NFC-enabled smartphone. What is MIFARE Classic Tool 2.3.1?
Disclaimer: This tool should only be used for research, education, or authorized testing on tags that you own or have explicit permission to test. Summary of 2.3.1 vs. Newer Versions mifare classic tool 2.3.1
APK (available on F-Droid or GitHub ). A MIFARE Classic tag (e.g., key fob, access card). 2. Core Functions Guide A. Read Tag (Basic) Open the app and select Read Tag .
If you are a systems integrator: Stop using MIFARE Classic. Today. And if you must use it for legacy reasons, at least use diversified keys and monitor your readers for the unique RF patterns of a —specifically the version signature left by MCT 2.3.1. Select "Write Dump" on the "destination" card, ensuring
The app will try different keys to unlock sectors and display the dump. 3. Writing to a Tag
From a privacy standpoint, MCT 2.3.1 shows a clean bill of health. A static analysis report from Exodus Privacy for this version found in the application's code. It only requests the core permissions it needs to function: NFC control and write access to external storage for saving files. Summary of 2
In the world of physical access control, public transportation, and contactless micro-payments, one name stands out as both a veteran and a favorite target for security enthusiasts: . For over two decades, this NXP Semiconductors chip has been embedded in millions of cards and fobs globally. But where there is widespread adoption, there is also curiosity—and sometimes, vulnerability.
MIFARE Classic Tool 2.3.1 is more than an app; it is a monument to open-source reverse engineering. It democratized RFID hacking, taking it from $1,000 Proxmark rigs to a $50 used Android phone.
MIFARE Classic uses a proprietary encryption algorithm called , which employs a 48-bit key for authentication. Each sector of a MIFARE Classic card is protected by two 48-bit keys: Key A and Key B . The sector trailer block (block 3 of each sector) stores these keys along with access condition bytes that control permissions.
