“The reflected signals contain a lot of information,” Shamir said. “We can see the point where the chip is unhappy if a wrong bit is sent and consumes more power from the environment…to write a note to RAM that it has received a bad bit and to ignore the rest of the string,” he added.

“I haven’t tested all RFID tags, but we did test the biggest brand and it is totally unprotected,” Shamir said. Using this approach, “a cellphone has all the ingredients you need to conduct an attack and compromise all the RFID tags in the vicinity,” he added.

tratto da EE Times attraverso Slashdot