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TECHFIND - SENSORS
Unclonable RFID
A California based company has developed an unclonable chip system which is being applied to mass-market RFID tags. The company’s products are based on a physically unclonable function (PUF) cast as a circuit. PUFs use random variations in the delays of wires and gates on a chip (the chips silicon DNA) to create a unique response when challenged during an authentication session. The authentication regime consists of a 64-bit pulse train challenge issued to the serial PUF circuit, whereupon the chip returns a 64-bit pulse train response that is unique to its manufacturing variations. Since the challenge/response pairs for each chip are unique, they can be cataloged in a database at the factory, and then compared with those returned during interrogation later in the field. The encrypted DNA can be taken offline and written to the tags nonvolatile memory for real time rejection of cloned RFID tags, which will not match the calculated response.
Media Spiders®
A California based company has developed an unclonable chip system which is being applied to mass-market RFID tags. The company’s products are based on a physically unclonable function (PUF) cast as a circuit. PUFs use random variations in the delays of wires and gates on a chip (the chips silicon DNA) to create a unique response when challenged during an authentication session. The authentication regime consists of a 64-bit pulse train challenge issued to the serial PUF circuit, whereupon the chip returns a 64-bit pulse train response that is unique to its manufacturing variations. Since the challenge/response pairs for each chip are unique, they can be cataloged in a database at the factory, and then compared with those returned during interrogation later in the field. The encrypted DNA can be taken offline and written to the tags nonvolatile memory for real time rejection of cloned RFID tags, which will not match the calculated response.
