BigWallop
Guest
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 Posted:
Thu Jan 13, 2005 2:42 am Post subject:
Re: Authentication Algorithm for embedded RFID device |
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<roeido@yahoo.com> wrote in message
news:1105550819.749834.282390@c13g2000cwb.googlegroups.com...
| Quote: | Hi All,
I need to write algorithm (to code later in C) for an embedded RFID
device.
I have a reader and a tag and I want to authenticate that the tag is an
original one ( there is no need to authenticate the reader for the
tag).
To do so the tags will have a secret number that is know in advance to
the reader. The secret number will be put in manufacturing.
The authentication will be as follow:
1. The reader will send a random number to the tag.
2. The tag will do a certain algorithm with his secret number and the
random number and will send the result to the reader.
3. The reader will authenticate the return number and will send an ACK.
4. The tag will then send is ID number, (The ID number is not the
secret number, the secret number is never transmitted between the tag
and the reader)
I need to fine a good and simple algorithm (for 8 bit microcontroller
with low power) to do the work as describe in stage 2.
Any suggestion? Any useful links? Source code?
BTW if you have a better scenario to achieve the authentication I'll be
happy to read about.
Thanks in Advance
Roy
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We in the alarm trade normally buy these things ready made, my friend.
http://www.roadtraffic-technology.com/contractors/access_control/tagmaster/
http://www.rfidinc.com/ |
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