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[Lars Kvanum]

Thanks :)

By reverse engineering I'm not talking about the card, but the access scheme set by the company that handles our security cards. Thing is they'll take upward of $50 for a keyfob I can make for less than $1. As the card readers aren't connected to a central server they're not checking uid and they're not logging anything. If I can reverse engineer the scheme I can set up fascilities for our janitor to create keyfobs and save the building cooperative (?) a #¤%load of money :)

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[Lars Kvanum]

Thanks for the input :) My cards are "magic", so block 0 is writable :)

If I set the access bytes incorrect, won't I even be able to format the cards to make them writable again?

Also, is there a good editor for creating my own data? I'm playing around with the access tokens for the building and reverse engineering them is a fun way of learning :D

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