13.56 MHz NFC HF Full Passive and Analog Tag with a Chaotic Duffing Resonator to Achieve Secured Authentication

Identification and authentication are major challenges in our society. Radio-Frequency IDentification (RFID) has been in use for more than twenty years. However, authentication usually requires complex digital systems, such as crypto-processors, which significantly increase the cost of the end device. These techniques remain incompatible with many applications where cost is critical. This paper presents preliminary work describing how a transponder at 13.56 MHz can be designed to enable authentication between a fixed reader and a full passive and analogue tag. The antenna is based on an inductive loop, similar to any Near-Field Communication (NFC) tag. The incoming Amplitude Modulated (AM) wave is rectified to provide power to a chaotic system based on a Duffing resonator. The produced chaotic signal is then used to modulate the load connected to the loop antenna to produce a chaotic but deterministic back-scattered signal that can be authenticated by the fixed reader.