Reply To: Mifare authentication string

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Re: Mifare authentication string

2. August 2017 at 13:17

When you write “I want to write an authentication code in sector12” then this are private data and has nothing to do with the authentication to the MIFARE Classic. Generally, if you want to write or read from sectors 0, 1, 2 or 3, you have to authenticate first to one of this sectors. E.g.: Authenticate to sector 0, then read from sector 0 (or 1, 2 or 3).

The blank card has default keys (0xFFFFFFFFFFFF). The last action you should do is to authenticate with the default key and write a new key value to the sector trailer. All further accesses must use the new key value for authentication.

The TapLinx team

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