Abstract: A system for detecting hardware Trojans in a computerized device includes a digital circuit having switching components operating pursuant to at least one clock frequency and positioned within an interrogation range of an incident carrier wave. A modulated backscatter response is reflected from the digital circuit upon arrival of the incident carrier wave in the presence of the switching operations. A detection device is positioned to receive the modulated backscatter response. A computer connected to the detection device identifies harmonics of a respective clock frequency of the digital circuit from the backscatter response and identifies characteristics of the harmonics indicating a presence or an absence of a hardware Trojan connected to the digital circuit.

Abstract: A semi-passive radio frequency identification (RFID) tag includes a digital circuit with switching components operating within an interrogation range of an incident carrier wave. A plurality of input connections and output connections direct data communications through the switching components within the digital circuit, and the data communications are subject to switching operations of the switching components between at least one of the input connections and at least one of the output connections. A backscatter response reflected from the digital circuit upon arrival of the incident carrier wave, wherein the backscatter response is a modulated backscatter response in the presence of the switching operations.

Abstract: A semi-passive radio frequency identification (RFID) tag includes a digital circuit with switching components operating within an interrogation range of an incident carrier wave. A plurality of input connections and output connections direct data communications through the switching components within the digital circuit, and the data communications are subject to switching operations of the switching components between at least one of the input connections and at least one of the output connections. A backscatter response reflected from the digital circuit upon arrival of the incident carrier wave, wherein the backscatter response is a modulated backscatter response in the presence of the switching operations.