Science Daily November 23, 2021
Traditional encryption methods are challenging to scale for high-bandwidth, ultralow-latency applications. An alternative approach is to use physical-layer techniques that rely on the physics of signal propagation to incorporate security features without the need for an explicit key exchange. Ensuring security using directional, narrow-beam-like features of mm-wave/THz signals has proven to be vulnerable to passive eavesdroppers. An international team of researchers (USA – Princeton University, China) has developed a space-time modulation approach that ensures security by enforcing loss of information through selective spectral aliasing towards the direction of eavesdroppers, even though the channel can be physically static. This was achieved by using custom-designed spatio-temporal transmitter arrays realized in silicon chips with packaged antennas operating in the 71–76 GHz range. They analytically and experimentally demonstrated the resilience of the links against distributed and synchronized eavesdropper attacks in the mm-wave band…read more. TECHNICAL ARTICLE
Physical-layer security approach to enforce intentional spectral aliasing and loss of information in the Alice-to-Eve channel…Credit: Nature Electronics volume 4, pages827–836 (2021)Â