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  1. #1
    Registered User
    Join Date
    Feb 2009
    Posts
    2

    External Mifare keys changed after write data from Nokia 6131 NFC

    Hi!

    This is my first post in the forum. I'm starting right now in the J2ME and NFC world.

    I've started playing with the Nokia 6131 NFC trying to save a contact information to a Mifare 1k, using the contact > options > transmit to tag. The contact is correctly saved in the mifare card, so it is read correctly by the phone.

    The mifare card by default has keyA=FFFFFFFFFFFFFF and keyB=000000000000, and I can access it before write the contact (I can read the manufacturer data with no problem with an external card reader, sending the specific APDUs to it). After writing the contact I can not access the mifare.

    It seems that the keys have been changed, so when I try to read any block in the card, a Authentication Error is returned.

    Anyone can help me with that? If the keys are changed, which are these new keys?

    Thank you very much in advance

    Guillem

  2. #2
    Regular Contributor
    Join Date
    Jul 2007
    Location
    Lisbon - Portugal
    Posts
    96

    Re: External Mifare keys changed after write data from Nokia 6131 NFC

    For the first 4 blocks (Mifare Application Directory Area):
    KeyA = A0A1A2A3A4A5
    KeyB = D3F7D3F7D3F7

    For the remaining sectors:
    KeyA = D3F7D3F7D3F7
    KeyB = D3F7D3F7D3F7

    These are explained in the Nokia 6131 NFC SDK documentation.

  3. #3
    Registered User
    Join Date
    Feb 2009
    Posts
    2

    Re: External Mifare keys changed after write data from Nokia 6131 NFC

    Thank you very much

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