Posted on 11/23/2012 6:15:04 PM PST by brityank
Actually, the cards themselves don't actually contain the information. What the do contain is a transmitter and a very tiny computer chip that will, when activated. broadcast a 64-bit or 128-bit number. It is the number that identifies the holder of the card by way of a look-up table in the system reading the cards. I haven't looked through the RFCs for these chips in a long time, but I don't thinkthe protocol is, at present, set up so the cards need to have any more information than the identifying number.
Depending upon how it is implemented, the number broadcast may, or may not be encrypted. If the transmission is not encrypted, it is trivial to program another RFID chip to answer with any number desired. What would be cool, would be to determine the superintendant's ID number on his card, and have it showing up at random times in the girls's bathroom.
There are lots of ways to hack the system. A setup like this school could provide lots of opportunities for mischief.
It is my understanding that RFIDs can be hacked.
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