DESFire EV1 response

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  • 17. March 2016 at 11:11

    Jan Jan
    i have problem about card response
    1. use a empty card and select card ,I get ATQA:0x4403 and SAK:0x20
    2. use GetKeyVersion and card response 0x00
    3. do step 1 again ,this time Card no any response
    4. do step 2 again, this time card response 0x00 and 2 bytes look like is Random number
    Have someone can tell, Why extra 2 bytes and what is it?
    What kind of situation will happen that?
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    Re: DESFire EV1 response

    1. April 2016 at 10:40

    mifaresdk
    Hi Jan,

    The SAK and ATQS bytes are used in the communication between the reader and card to deal with the communication parameters. For instance a reader can set a higher bit rate if the card support this.

    You find the exact parameters for each MIFARE product in the datasheets.

    Kind regards,
    The MIFARE Team
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