From: Byron Sonne (blsonne@rogers.com)
Date: Sat Dec 17 2005 - 13:28:35 EST
> I'm looking at how far RFID can be sniffed...
I doubt it's going to be sniffable very far. All of the RFID stuff I've
seen works much like proximity readers for the swipe cards that I use to
get into the building at work.
The tags, much like the prox cards, first have to be energized by the
reader themselves, and generally only exchange information under
distances of half a metre or so, usually less. The energizing takes
place on one frequency, and the transmission back from the tag/card
takes place on another (usually higher?) frequency. Think about it: if
all these tags were live and transmitting the whole time, I don't care
if it's spread spectrum or not, you're talking about potentially
hundreds of thousands of items spitting out data. That would be rather
hard to manage.
There is of course larger more powerful units, like toll highway
transponders for cars/trucks. or the ones used on trains and freight
cars. But those are still designed for rather short distances.
This isn't 802.11 or bluetooth, I don't think you'll be able to sit in a
parking lot outside and read the inventory with a hacked up antenna.
Unless you have some crazy kind of technology or something, in which
case, I want in on it :)
Cheers,
Byron
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