Phys.org November 6, 2020
Hardware-based Physical unclonable function (PUF) semiconductor chips have a unique physical code, however, the hardware structure had to be changed to increase the number of combinations of keys to enhance cryptographic characteristics. An international team of researchers (South Korea, USA – AFRL) has developed an encryption device that can greatly strengthen the cryptographic characteristics of PUFs selectively detecting circular polarization, without modify the hardware structure. They developed a phototransistor that can detect the circular polarization of light rotating in a clockwise or counterclockwise direction. As a proof‐of‐concept, the chiral phototransistor arrays are demonstrated as a physically unclonable function device and exhibit enhanced cryptographic characteristics…read more. TECHNICAL ARTICLE
A Schematic Diagram of the Major Strategies for the Development of Near-infrared Radiometric Sensitivity Photovoltaic Transistor. Credit: Korea Institute of Science and Technology (KIST)