Abstract
This paper proposes a novel hyper-chaos-based colour image encryption technique and uses cryptanalysis to examine its resistance to intruders. The encryption technique uses hyper-chaotic sequence-dependent diffusion, combined with multi-layered scrambling utilising Local Bit Scrambling (LBS), Global Bit Scrambling (GBS), and pixel scrambling with Arnold Cat Map (ACM) to increase the security level. In contrast to the commonly used RGB channel, we opted for the YCbCr-channel for encrypting the colour image. More layers of diffusion and scrambling have been performed on the higher informative Y channel (luminance channel). On the contrary, the other channel (the less informative 'chroma channels', i.e., Cb, Cr) goes through fewer stages. It minimises computing complexity in comparison to other state-of-the-art works without compromising security. Several commonly used security-testing parameters and the NIST test evaluate the security strength. A comparative study with current and related research works is performed to show the proposed algorithm's superiority in security.
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