Comparison of encryption quality assures that the proposed system has better encryption effect than existing one and exhaustive attack analysis proves the robustness.
Assessment results proves the ability of the algorithm to resist statistical and differential attacks. Evaluation results shows that the proposed pre-processing system has better performance with minimum cost than other available pre-processing methods. In diffusion phase, a novel structure of bit level merging and circular shifting operation is adopted to strengthen the security level, further an inter – exclusive OR (XOR) operation is executed between each layers (Red, Blue, Green) to obtain cipher image. Position of pixels are scrambled in confusion phase by applying the chaotic series of hyper Lorenz system.
In the present study, a robust color image cryptosystem based on a novel structure of chaotic pre-processing is proposed, which greatly reduce the execution time and memory usage and also increase the performance of confusion and diffusion phases.
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