The Synchronisation is the Message: Real-World Encrypted Communication Based on Synchronised Chaotic Circuits Without Using a Dedicated Synchronisation Line

This work expands the current state of the art in the field of chaos-based cryptography, by removing the need for a dedicated synchronisation line that provides a shared information channel between the relevant transmitter and the receiver devices. We present two different real-world implementations of a secure digital communication system based on chaotic circuits that are synchronised without a dedicated synchronisation channel; one using Chua circuits and one utilising Lorenz circuits. Thus, our work proves that this approach is rather applicable to a large number of different types of chaotic circuits that can be utilised for the implementation of a chaos-based secure communication system without the need for a dedicated synchronisation connection, thus eliminating a number of potential security issues and concerns.