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This work presents the hardware demonstrator of a secure encryption systembased on synchronised Chua chaotic circuits. In particular, the presentedencryption system comprises two Chua circuits that are synchronised using adedicated bidirectional synchronisation line. One of them forms part of thetransmitter, while the other of the receiver. Both circuits are tuned tooperate in a chaotic mode. The output (chaotic) signal of the first circuit(transmitter) is digitised and then combined with the message to be encrypted,through an XOR gate. The second Chua circuit (receiver) is used for thedecryption; the output chaotic signal of this circuit is similarly digitisedand combined with the encrypted message to retrieve the original message. Ourhardware demonstrator proves that this method can be used in order to provideextremely lightweight real-world, chaos-based cryptographic solutions.

Real-World Chaos-Based Cryptography Using Synchronised Chua Chaotic Circuits