Desfire Native decrypt read response

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  • 15. October 2023 at 18:49

    Stefan Winter
    After authenticating on Desfire with 90 AA (AES) I try to read from the file-0 (90 BD), which is successful with response 91 00.
    But the decryption with the correct key does not produce useful data.
    There must be some issue with the IV, because only the 1st 16 bytes are wrong. As I know I have to encrypt the APDU including the CRC-32, but I could not find the exact description anywhere.
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    Re: Desfire Native decrypt read response

    18. October 2023 at 7:12

    Stefan Winter
    The solution is to run through the CMAC process for decryption.
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