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Story: Privacy groups protest RFID tagging of razors

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Posted by: Anonymous (Tuesday 26 August 2003, 2:07 AM)

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folks: here is something to ponder: rfid is originally designed to tag cows!!

RFID works like this:

an antenna (usually huge ones) emit a radio wave that 'ask' nearby tags to report themself.

the tag is a passive device, with no battery. it gains the energy to report back by converting part of the radio wave energy to electricity.

it could be 2 way or 1 way comms: 1 way means antenna "ask: who are you?" and the tag answers "I am gilete stock number 123, expires 12/2003"

2 way means:
antenna ask "who are you?"
tag answers "I am a gilete"
antenna ask "ok, now your name is shick"
tag answers "ok, new name accepted"

It is interesting to have a handheld antenna and retrive data from individual tags. maybe should try that.

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