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  1. #1
    Registered User
    Join Date
    May 2007

    Change MiFare (a/b) Key on external tag

    Found the answer to my question.

    This document does a good job of describing Mifare .


    and this post:


    Hello All,

    Currently using an external writer I am able to write NDEF records to tags that were previously written to by the Nokia 6131.

    I am also able to use an external writer to write to a new tag that has its key-a and key-b set to ff ff ff ff ff ff. The problem is the 6131 refuses to read the newly written tag unless its key-a is set to d3 f7 d3 f7 d3 f7 .

    So my question is can anybody point me to a Mifare document that explains how to write a new 'key-a' / 'key-b' and what the ACL's are for the keys .

    Last edited by gngulrajani; 2007-07-04 at 17:02.

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