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  1. #1
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    SmartPoster tag keys

    I can read and write to smart poster tag with several 6131 with no problem. But i can't read neither write to smart poster using a regular Mifare reader. Does somebody know what are the keys (keyA & keyB) used by the 6131 with writing/reading to smart poster.

    Thanks,
    Lionel

  2. #2
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    Re: SmartPoster tag keys

    Did you try keyA 000000000000 & keyB FFFFFFFFFFFF ? Not sure.

  3. #3
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    Re: SmartPoster tag keys

    I can't still figure out what the new key value are:

    i have done the following test:

    i take an empty rfid tag and using a reader i can read the whole content with keyB="FFFFFFFFFFFF". The content is:
    rec 0 : 74.FD.08.0C.8D.88.04.00.46.8E.45.92.49.30.11.05
    rec 1 : 00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00
    rec 2 : 00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00
    rec 3 : 00.00.00.00.00.00.FF.07.80.69.FF.FF.FF.FF.FF.FF
    rec 4 : 00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00
    rec 5 : 00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00
    rec 6 : 00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00
    rec 7 : 00.00.00.00.00.00.FF.07.80.69.FF.FF.FF.FF.FF.FF
    ...
    ...

    where we can see that KeyA is "000000000000" and KeyB is "FFFFFFFFFFFF" for all sectors.

    Then i use a 6131 to write a contact information in the tag (select the contact, select Options, then click on Transmit bus. card). The tag have been properly written as i can read the content with an other 6131.

    Then i try to read the tag with a reader again, and now sector 0 can be read by key="A0A1A2A3A4A5" only and the content is:
    rec 0 : 74.FD.08.0C.8D.88.04.00.46.8E.45.92.49.30.11.05.
    rec 1 : D8.01.03.E1.03.E1.00.00.00.00.00.00.00.00.00.00.
    rec 2 : 00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.
    rec 3 : 00.00.00.00.00.00.78.77.88.C1.00.00.00.00.00.00.

    sector 1 & 2 can't be read.

    It seems that Keys for sec 0 to 2 have been changed to new values. I guess maybe those new keys value are default 6131 keys value as the tag be read by other 6131 (i use 6131 version 3.10 23-01-07), or maybe they are written in the tag somewhere. How can i know the key value after a tag has been written ??

    Other sector's keys have been unchanged (still 00..00 and FF..FF)

    Thanks,
    Lionel
    PS: please note that the tag can't be read with a 6131 version 01.70 15-09-06

  4. #4
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    Helsinki, Finland
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    91

    Re: SmartPoster tag keys

    Then i try to read the tag with a reader again, and now sector 0 can be read by key="A0A1A2A3A4A5" only
    Yes, the first sector can be read using the keys you are mentioning.
    There are essentially 2 keys used for reading NDEF tags:

    1. keys used for the MAD area, which are:
    A0A1A2A3A4A5

    2. keys used for the NDEF area, which are:
    D3F7D3F7D3F7
    I hope this helps.
    Raluca Cindrea
    Helsinki, Finland
    www.nokia.com/nfc

  5. #5
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    Re: SmartPoster tag keys

    hello Reluca,
    thanks for your answer.

    You mentioned that the first sector is the MAD Area. Which information are in that Area, what is it for ?
    Also is seems that the NDEF area start record 4 byte 2, what byte 0 & 1 stand for ?

    Thanks,
    Lionel

  6. #6
    Regular Contributor
    Join Date
    Mar 2003
    Posts
    53

    Re: SmartPoster tag keys

    Hi Lionel,

    The first Sector (Sector 0) has like any other sector 4 blocks. Each Block has 16 bytes.
    Sector 0
    1. BL is the Manufacturer Block
    2. BL Data Block (MAD)
    3. BL Data Block (MAD)
    4. BL Trailer Block (Key A, Access Bytes, Key B)

    Sector 1
    1. BL Data Block
    2. BL Data Block
    3. BL Data Block
    4. BL Trailer Block (Key A, Access Bytes, Key B)

    Sector 2-n
    same as Sector 1


    MAD stands for Mifare Application Directory. The Application Identifiers (AID) s of "registered card application entries" are placed there.
    The descriptiption is complicated, better you look at the document:
    http://www.nxp.com/acrobat_download/...on/M001824.pdf


    NDEF Record Layout:

    1. byte for different Flags > MB, ME, CF, SR, IL, 3xTNF
    2. byte > type length
    3-6. byte > payload length (can be 1 to 4 bytes long)
    4. byte > ID length
    5. byte > Type
    6. byte > ID
    7 - n. byte > Payload

    For a detailed description go to NFC Forum and download the specifications.
    http://www.nfc-forum.org/specs/
    NFC Data Exchange Format (NDEF) Technical Specification

    You will find the detailed answers in those documents.

    Best regards.

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