Key distribution method and system based on synchronized broadband physical random sources

US11336443B2 · kind B2 · utility

Assignee

• University of Electronic Science and Technology of China · CN

Inventors

• Ning Jiang · 红钢城街道, CN
• Kun Qiu · San Diego, US
• Anke Zhao · Chengdu, CN
• Shiqin Liu · Chengdu, CN
• Yiqun Zhang · Xi'an, CN

Key dates

• Filing date: Jul 30, 2020
• Grant date: May 17, 2022
• Expiry date: Jul 30, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L9/12
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

A key distribution method based on broadband physical random sources includes: utilizing a driving semiconductor laser to generate an optical signal, passing the optical signal through a phase modulator driven by a random signal and then equally dividing the phase-modulated optical signal into two identical paths, injecting the two identical paths into slave semiconductor lasers at both communication parties Alice and Bob's sides, respectively, to generate initial synchronized signals, using the generated initial synchronized signals as driving signals to phase-modulate optical signals generated by continuous-wave (CW) light sources, and inputting the modulated optical signals to dispersion modules; wherein after the modulated CW optical signals pass through the dispersion modules, two synchronized broadband noise-like random signals are generated, and then high-speed synchronized keys are generated by a post-processing method.