Secure Transmission via Block Cipher Strategy using Chaotic Systems and High Gain Observers

This paper proposes an advanced secure transmission of information method founded on synchronizing chaotic systems with an optimal high gain observer. The challenging idea investigated in this work is to insulate the encryption process from the synchronization operation relying on two chaotic systems, where the two systems are part of the encryption process and generate pseudorandom sequence of signals, which will be treated with Exclusive-OR operations to form the cipher relying on a carefully chosen secret key. After that, the dynamic systems will acts as transmitters. Finally, the decryption operation is carried out by replacing the chaotic system by its estimation one using the same secret key. Numerical simulation based on a QR (“quick response”) code encryption/decryption is conducted as an illustration to demonstrate the outstanding performances of the designed transmission method.