[ILUG] Re: Swipe Card System
Kiall Mac Innes
kiall.macinnes at pix.ie
Thu Aug 9 11:15:22 IST 2007
One last link for ya.. If you do decide to go down the embedded route...
http://www.gumstix.com/products.html run uClinux so should be easy to code
for and are _relatively_ cheap. (about 100-200$)
BUT... I'd say that's pretty unnecessary as an old PC would be more than
capable and could easily be hidden in a cupboard..
Also, one last bonus for RFID. The reader can be placed inside the house.
(mounted to the back of a window or so on..) so that means nothing to be
tampered with outside the house.
From: ilug-bounces at linux.ie [mailto:ilug-bounces at linux.ie] On Behalf Of Tony
Sent: 08 August 2007 22:22
Cc: Ken Guest
Subject: [ILUG] Re: Swipe Card System
Tony Groves wrote:
> Am I right in thinking that all RFID cards for a particular reader
> have to be identical? That would be no use. Each card has to be unique
> to the individual holder, for the purposes of authorisation checking
> and usage logging.
Robert Fitzsimons wrote:
> Each card has an unique ID number with some transponders (cards)
> having up to a 128-bit unique number. Also some transponders have
> built in EEPROM which can contain extra application specific data.
Philip Trickett wrote:
> Why don't you have a look at these:
> Not contactless, but the form factor is a lot easier to carry around.
> They are tough as well, I ran mine over with the car, it still
Michael Watterson wrote:
> No. Each RFID can store more unique information than a barcode. They
> are nearly as easy to read as a barcode and can be read at a distance.
> Fine for stuff in a shop or warehouse, or baggage routing at an
> airport, but useless to secure a building. Even an easily
> photo-copied cheap barcode is more secure because the owner would be
> able to secure it. RFID can be copied as owner walks past a car.
> Magstripe, or chip card or similar. I'm sure there are people
> selling RFID door locks but it will end in tears.
> For 250 people the magstripe would do. Cheap cards and unlike
> RFID the card has to be physically obtained to copy it. Available
> off the shelf. PC used to program cards and semi dumb embedded
> controller to operate lock. A card can be disabled on a the lock
> without PC. You program a master card and swipe the lock. This
> then cancels the unwanted card. Regulars can have a plastic card. Some
> systems can have a disposable (maybe 20c) cardboard mag card too
> thatworks a pre programmed number of times.
> Chip or "Chip and Pin" the reader is much cheaper but the "blank
> cards" are 10 to 20 times the price.
Sorry for the delay in responding, gents. Long weekend and all that ...
RFID cards sound OK. All I need to do is to record the serial number
each time a card is issued to a user. It seems that security is weaker
than other card types, but we're not dealing with Fort Knox or computer
The final choice of card technology will, I suppose, be down to finding
a suitable tough reader/lock, and a reasonable-cost supplier of
pre-printed cards. Which would seem to boil down to magnetic strip or
The access control and logging has already been discussed and I have a
choice of an embedded controller or an old PC. Probably the handiest
thing would be to start off with an old PC running Linux, and maybe
migrate to the unfamiliar technology of an embedded controller at a
OK, I've loads of feedback to go on now and plenty of links to research,
so I'll start figuring out suppliers and costs and see what's the best I
can come up with. Thanks for your time.
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