Faculty of Physics, “Alexandru Ioan Cuza” University, 11 Carol I Blvd., RO-700506 Iasi, Romania

Chua’s chaotic circuits are considered to be the cornerstone of chaotic circuits because they were the first electronic circuits generating chaotic signals, to be described by a nonlinear equations system. A large number of experiments and numerical simulations have been performed in order to have a better view over this type of circuits.

These circuits are studied for theoretical reasons (a better understanding of chaotic systems or chaos control) and more technical reasons (the large number of applications of these circuits in communications). It has been proved that the encryption of signals using chaotic circuits is one of the best methods. In order to use chaotic circuits to secure and send information they have to be synchronized. The impediment is that they have a chaotic behavior. Here, we present the conditions for which two chaotic systems (in our case they are two chaotic electronic circuits) can be synchronized. The synchronization of two chaotic Chua’s circuits is experimentally demonstrated.