Journal Article

Physically Encrypted Wireless Transmission Based on XOR between Two Data in Terahertz Beams

Takashi Shiramizu, Hanwei Chen, Yuya Mikami, Naoya Seiki, Yuta Ueda, Ming Che, Takuya Yano, Kazutoshi Kato

2023

Overview

Future wireless communications require higher security as well as a higher data rate. We have been studying physically secured wireless transmission systems and previously proposed encryption/decryption techniques based on the AND operation caused by coherent detection between two encrypted data sequences on two different terahertz carriers. Furthermore, we suggested that by employing the XOR operation as the decryption, the proposed system can be made more secure because XOR increases the computational complexity for eavesdroppers to recover the plaintext. In this paper, we propose the XOR operation between two data sequences on FSK-modulated terahertz waves. By constructing the XOR encryption transmitters/receivers, which consisted of high-speed wavelength tunable lasers and arrayed uni-traveling-carrier photodiodes (UTC-PDs), we successfully demonstrated the XOR operation between two data sequences on 200 GHz waves from the two transmitters.

• Publisher: MDPI AG
• Subject: Access control / Antennas / coherent detection; phased arrays; photodiodes; photomixing; terahertz communications; wavelength tunable laser; wireless communication system security; XOR operation / Communications systems / Data encryption / Data security / Eavesdropping / Embedded systems / Encryption / Methods / Mobile communication systems / Optics / Photodiodes / Radiation / Receivers & amplifiers / Terahertz frequencies / Terahertz radiation / Transmitters / Tunable lasers / Wireless communication systems / Wireless communications