“…Since the introduction of synchronizing two identical chaotic systems with different initial conditions by Pecora and Carroll in 1990 [31], different types of synchronization techniques have been rapidly developed. Among these include active control between two Lorenz systems [1], a backstepping approach between two Genesio systems [28,34], adaptive control [41,43,32], delay feedback synchronization [4], a variable structure method [20], a sliding model control [42], nonlinear feedback control [29,13], intermittent feedback control [14,37,45], etc. On the other hand, hyperchaos synchronization in which hyperchaotic systems possess more than one positive Lyapunov exponent has been studied in [8,9], utilizing an observer-design method.…”