Mifare Classic Tool 2.3.1 Repack Jun 2026

The relevance of MCT 2.3.1 is a direct consequence of NXP Semiconductors’ design flaw in the MIFARE Classic (MF1ICS50). The CRYPTO1 cipher, though robust against brute force attacks in 1994, is susceptible to a keystream recovery attack. MCT 2.3.1 automates this vulnerability by requesting the card to encrypt known plaintext (e.g., a zero-block). When the card returns the ciphertext, the XOR differential reveals the keystream, effectively breaking the sector’s security. This version is particularly dangerous because it removes the technical barrier to entry; a security guard, a disgruntled tenant, or a curious student with a $2 NFC tag can now execute attacks that once required a Proxmark III, a $300 device.

: You can write a saved dump file onto a new tag, effectively creating a 1:1 clone. This often requires special "Magic Cards" (CUID/UID-changeable tags) to write to the normally read-only Manufacturer Block (Sector 0). mifare classic tool 2.3.1

), which MCT can easily identify using its built-in dictionary. The relevance of MCT 2

For source code and further documentation, please visit the official GitHub repository. When the card returns the ciphertext, the XOR

The Sector Trailer contains bitwise flags determining read/write access for Key A and Key B. MCT v2.3.1 includes a parser that translates these hex values into human-readable permissions (e.g., "Key A: Read Only, Key B: Read/Write"). This is essential for identifying misconfigurations where keys are readable or write-protected incorrectly.