Color Image Cryptography Using Multiple One-Dimensional Chaotic Maps and OCML

In this paper, a stream color image cryptography has been proposed based on spatiotemporal chaos system. One-way coupled map lattices (OCML) are used to generate pseudorandom sequences and then encrypt image pixels one by one. By iterating randomly chosen chaotic maps from a set of chaotic maps for certain times, the generated pseudorandom sequences obtain high initial-value sensitivity and good randomness. The initial conditions of chaotic maps and parameters of the algorithm are generated by a 128-bit external key. Simulation results show that the proposed scheme is efficient and useful for the security of communication system.