Abstract
Due to their fundamental features, chaotic maps are very suitable for various image encryption schemes. Most of the proposed discrete chaotic cryptographic approaches are based on stream or block cipher schemes. If these two schemes are combined the security level is improved by enhancing the encryption process complexity, the key space and the robustness of the cryptosystem. In the beginning, the image is divided into two sub-images. Next, these two sub-images are encrypted using respectively stream and block cipher schemes. After that, the two sub-images are merged to create enciphered image. Simulation results have shown the effectiveness and the robustness of the proposed scheme.
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