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It's hard to have an extremely ranged limited RFID plate when only half the range is determined by the RFID chip itself -- a sufficiently large antenna on the r
by Johnny555 11y ago
It's hard to have an extremely ranged limited RFID plate when only half the range is determined by the RFID chip itself -- a sufficiently large antenna on the receiver can increase the range. Granted a passport that's supposed to readable from centimeters away will probably never be read a couple hundred meters away, but a license plate that can be read from a few meters away could be made readable from a hundred meters away.
Though I guess a smarter RFID plate could use latency to decide if a reader was "close enough", but that would make reliable reads harder since it would require several round trips.
- bigiain 11y agoPassport RFID reading demonstrated from 217 feet at BlackHat 2010 with just $2500 worth of eBay gear: http://www.networkworld.com/article/2215057/wireless/bad-guys-could-read-rfid-passports-at-217-feet--maybe-a-lot-more.html http://www.networkworld.com/article/2215057/wireless/bad-guy... The guy reckons 2 miles is theoretically possible with HAM radio-operator-legal transmit power (1.5kW) and the right antennas.