A Hierarchical Bilateral-Diffusion Architecture for Color Image Encryption
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초록
During the last decade, the security of digital images has received considerable attention in various multimediatransmission schemes. However, many current cryptosystems tend to adopt a single-layer permutation ordiffusion algorithm, resulting in inadequate security. A hierarchical bilateral diffusion architecture for colorimage encryption is proposed in response to this issue, based on a hyperchaotic system and DNA sequenceoperation. Primarily, two hyperchaotic systems are adopted and combined with cipher matrixes generationalgorithm to overcome exhaustive attacks. Further, the proposed architecture involves designing pixelpermutation,pixel-diffusion, and DNA (deoxyribonucleic acid) based block-diffusion algorithm, consideringsystem security and transmission efficiency. The pixel-permutation aims to reduce the correlation of adjacentpixels and provide excellent initial conditions for subsequent diffusion procedures, while the diffusionarchitecture confuses the image matrix in a bilateral direction with ultra-low power consumption. The proposedsystem achieves preferable number of pixel change rate (NPCR) and unified average changing intensity (UACI)of 99.61% and 33.46%, and a lower encryption time of 3.30 seconds, which performs better than some currentimage encryption algorithms. The simulated results and security analysis demonstrate that the proposedmechanism can resist various potential attacks with comparatively low computational time consumption.
Abstract
During the last decade, the security of digital images has received considerable attention in various multimediatransmission schemes. However, many current cryptosystems tend to adopt a single-layer permutation ordiffusion algorithm, resulting in inadequate security. A hierarchical bilateral diffusion architecture for colorimage encryption is proposed in response to this issue, based on a hyperchaotic system and DNA sequenceoperation. Primarily, two hyperchaotic systems are adopted and combined with cipher matrixes generationalgorithm to overcome exhaustive attacks. Further, the proposed architecture involves designing pixelpermutation,pixel-diffusion, and DNA (deoxyribonucleic acid) based block-diffusion algorithm, consideringsystem security and transmission efficiency. The pixel-permutation aims to reduce the correlation of adjacentpixels and provide excellent initial conditions for subsequent diffusion procedures, while the diffusionarchitecture confuses the image matrix in a bilateral direction with ultra-low power consumption. The proposedsystem achieves preferable number of pixel change rate (NPCR) and unified average changing intensity (UACI)of 99.61% and 33.46%, and a lower encryption time of 3.30 seconds, which performs better than some currentimage encryption algorithms. The simulated results and security analysis demonstrate that the proposedmechanism can resist various potential attacks with comparatively low computational time consumption.
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