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It's like a normal rfid sticker, but modified to not respond
to any rfid signal unless it has the correct signal.
You inset it into a valuable product, then you register it
with the police. As soon as it enters a pawnshop, the
pawnshop owner is able to check if it is stolen by querying
device with a list of know stolen items.
If the rifd detects that it's id is called, it replies. Otherwise
it stays silent.
This preserves a bit of privacy for the owner, while also
allowing the owner to drastically make the product harder
to sell to a pawnshop.
||I like the idea [+]... But I assume to make this
useful the thief either has to not know about
these devices (unlikely) or not be able to find the
device. As a sticker-type RFID, it seems this might
be hard to hide in some cases, but these could
come in other form factor to help with that.
||The design would have to be really careful to
ensure that there are no EM emissions from the
processor in the RFID while checking for code or
else it might be possible to create a device to
detect the presence of the challenge response
||This reminds me of the radar detectors, radar
detector detectors (for states where detectors
were illegal), and stealth radar detectors that
would shut down to avoid detection when they
detected a detector detector.
||Unfortunately this is likely to be somewhat of an
arms race, so you'll need to upgrade your RFID tags
fairly often to avoid easy detection.
||I thought about maybe having such an RFID
manufactured into the device, so then everyone
knows it's there, but you can't remove it without
damaging the protected item. In that case, you
could pretty much go with a standard RFID (foil
covered for privacy) or just the printed serial