Merit_Based_Auth_BF

A developer is experimenting with a counter‑less, merit‑based authentication methods.

Level 1 is their first attempt.

Application AID A0000000624857494F4348414C4C

SELECT LEVEL Use this command to select a level.

Note: Selecting the same level twice has no effect (it does not reset the authentication state).

Field Value Description CLA 08 INS 01 P1 XX Level selector (see below) P2 00 Possible P1 values Level P1 Description 1:LEVEL_BRUTE_FORCE 1 Brute force level 2:LEVEL_TEAR_IN_LOOP 2 Tear within a loop 3:LEVEL_TEAR_AT_INDEX 3 Tear at a specific index GET STATUS Field Value Description CLA 08 INS 57 P1 00 P2 00 The returned value represents the card state:

1st byte: 00 if not authenticated, 01 if authenticated. 2nd byte: The current selected level. 00 if no level is selected. GET FLAG Field Value Description CLA 08 INS 42 P1 00 P2 00 You must be authenticated to get the flag!

AUTHENTICATE Field Value Description CLA 08 INS 20 P1 XX P2 XX Use this command to authenticate.

The following values are relevant only for level 1. Possible returned status words:

Incorrect parameters (P1, P2): 0x6A86 Wrong parameter value (P1, P2): 0x6B00 Tools: You can ask us a Proxmark3 RDV4. You can reflash its main firmware if needed but NEVER reflash the BOOTROM!! And firstly, make sure ModemManager is NOT running on your Linux.

The code repository and documentation are on https://github.com/RfidResearchGroup/proxmark3.