I. Introduction
The chaotic encryption algorithm was first proposed by Matthews [1]. Since then, different image encryption algorithms based on chaotic systems have been developed [2]–[5]. Different chaotic properties such as sensitive dependence on initial conditions and system parameters, pseudorandom property, non-periodicity and topological transitivity motivate the scholars and researchers to set their eyes on the works involving chaotic encryption. Lately, fractional order extensions of some well known chaotic attractors have been developed and used for the purpose of encryption [6], [7]. These fractional order chaotic systems are known to provide a larger and more sensitive key space due to the fact that the dynamics of fractional order chaotic systems are not dependent only on the initial conditions but also on the derivative orders.