Abstract
A new image encryption scheme is proposed with a combination of block scrambling, closed-loop diffusion, and DNA molecular mutation. The new chaotic block scrambling mechanism is put forward to replace the traditional swapping rule by combining the rectangular-ambulatory-plane cyclic shift with the bidirectional random disorganization. The closed-loop diffusion strategy is designed to form a feedback system, which improves the anti-interference capacity of the algorithm. To further destroy the blocks characteristics and eliminate the correlations among adjacent blocks, two efficient methods of DNA molecular mutation are adopted in the mutation stage. Moreover, the proposed algorithm possesses a large key space and the keys are highly related with the plaintext image. Experimental results demonstrate that the suggested image encryption strategy is practicable and has strong ability against a variety of common attacks.
Highlights
Lots of images travel over the Internet due to the shareability and the openness of network transmission, which may threaten the security of private image information
Image Encryption Scheme Based on Block Scrambling, Closed-Loop Diffusion, and DNA Molecular Mutation
To validate the reliability and the security of the proposed image encryption scheme based on block scrambling, closed-loop diffusion, and DNA molecular mutation, a series of numerical experiments with test images of size 256 × 256 are carried out
Summary
Lots of images travel over the Internet due to the shareability and the openness of network transmission, which may threaten the security of private image information. Quite a few image encryption algorithms sorted the random sequences generated from chaotic systems, and the positions of the image pixels are rearranged with a group of index numbers. To hide the statistical structure of plaintext more effectively, Sheela alternately employed the two-level diffusion operations and the pixels transform in image encryption system. E kernel of these image encryption algorithms was to encode the image pixels with the DNA encoding rules and to perform biological and algebraic manipulations on the encoded sequence. The closed-loop diffusion strategy could form a feedback mechanism among the key block, the plaintext image, and the ciphertext image.
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