: For any security testing on a live system, you need documented permission from the system owner clearly stating the scope, duration, and limitations of the testing.

: Read and write specific data blocks within the card's memory sectors.

He stared. That wasn’t random. He converted the hex to ASCII.

: You should only test cards that you own personally or have explicit permission to assess. Testing third-party cards without authorization constitutes a criminal offense in most jurisdictions.

[+] Nonce found. Recovering key for sector 0...