Simple Chaotic Electronic Circuits

In recent years, a growing number of cryptosystems based on chaos have been proposed. The majority of them are based on parameter modulation of a chaotic oscillator being the transmitter while the receiver is also a chaotic system synchronized by means of an adaptive observer. For example, a Lorenz’s attractor is used as the non-linear time-varying system while the encryption process modulates the parameters that affect the shape and complexity of the corresponding strange attractor with the binary encoded plaintext. In general, the security of chaotic cryptosystems is based on the chaotic behaviour of the output of electronic non-linear systems which produce Lorenz type time series. In order to enhance the level of security of the transmission system various novel communication schemes that combine conventional cryptographic methods and synchronization of chaotic systems have been developed. A common feature of these systems is the utilization of the state variables of the chaotic systems (other than the transmitted ABSTRACT