Enhanced Bidirection Secure Communication Based on Digital Key and Chaotic Random Optical Feedback

Abstract

A novel bidirection secure communication scheme based on the digital key and chaotic random optical feedback is proposed and numerically verified. Digital sequence is used as a key to control random variation of external cavity optical feedback, and under the operation of this random feedback, high-dimensional chaotic light is generated with complex dynamics. It is proved that chaotic time delay signature is effectively suppressed and key space increases significantly, which enhances the security of chaotic secure communication. Meanwhile, the bidirection chaotic secure communication is successfully implemented with the message rate of 10 Gb/s. In addition, simulation results show that the proposed scheme increases system synchronization and reduces the bit-error rate of the transmitted message.

Review on the broadband time‐delay‐signature‐suppressed chaotic laser

“…In order to suppress the TDS of a chaotic signal, scholars have carried out extensive researches, including fiber grating feedback, [69][70][71][72] fiber dispersion effect, [73][74][75] fiber backscattering effect, 76,77 external optical injection, [78][79][80] and other. [81][82][83]…”

“…In addition, the identification methods of the TDS also include delayed mutual information 66 and permutation entropy 67 in the time domain, and the spectrum identification method 68 in the frequency domain. In order to suppress the TDS of a chaotic signal, scholars have carried out extensive researches, including fiber grating feedback, 69–72 fiber dispersion effect, 73–75 fiber backscattering effect, 76,77 external optical injection, 78–80 and other 81–83 …”

A memristive chaotic system and its application in weak signal detection

“…People are no longer satisfied with simply observing and studying chaotic phenomena but are also turning towards the control of chaotic systems. Nowadays, chaotic systems are commonly applied in various fields, such as economics [1], natural ecosystems [2], image processing [3,4], secure communication [5][6][7], artificial intelligence [8,9], signal detection [10,11], random signal generation [12,13], chaos control [14][15][16], etc.…”

An Enhanced Electro-Optic Chaos Secure Communication System Immune to Time Delay Signature Extraction

“…The primary reason for the effectiveness is the fact that the correlation between the chaotic signal x(t) and its delayed version x(t − s) will reach the maximum when s = τ , where τ is the time delay parameter of the chaotic system [18]. An enormous amount of research effort goes into suppressing this statistical characteristic of TDS [19], [20], [21], [22]. Unfortunately, it is recently discovered that there is still some security vulnerability from the perspective of dynamics.…”