Abstract

The impact of digitisation on chaos synchronisation and message decoding in a chaotic cryptosystem is described. The sampling rates and resolutions that lead to a good decoding of the message are determined numerically and experimentally. The results are interpreted in light of Shannon's sampling theory.

Highlights

  • The properties of chaotic systems can be exploited to realize secure communications

  • We examine the influence of the distortions induced by the sampling and quantisation processes on chaos synchronisation and message decoding

  • For Optoelectronics each resolution, the sampling rate was varied between 48 kHz and 1 MHz

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Summary

Introduction

The properties of chaotic systems can be exploited to realize secure communications. The noise-like appearance of chaos and its broadband spectrum can be used to hide an information-bearing message. The following parameter values were used for the transmitter and receiver systems: Λ0 = 1.55 μm, T = 512 μs, βλ = 500 pm, D = 22 mm, and the cut-off frequency of the low-pass filter was fc = 20 kHz, leading to a response time τ of 8 μs.

Results
Conclusion

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