Abstract
In the past, many image encryption schemes have been developed through the swapping operations at the different levels of granularity. These levels span bits, Deoxyribonucleic acid (DNA) molecules, pixels, blocks of pixels. In this study, a new scheme for the encryption of color images based on the DNA strands level scrambling (DNASLS) and chaotic system has been proposed. After a color image is input, it is decomposed into the red, green and blue components. After it, these components are merged to form a big single image. Intertwining logistic map (ILM) has been used for the random data which generates three streams of random numbers. These streams have been further manipulated in such a way that nine streams are spawned out of them. One stream out of these nine streams has been used for the generation of a key image. Two streams have been used to DNA-encode the big single image and the key image. Afterwards, the strands of DNA-encoded single image are swapped with each other. Four streams determine the addresses of two DNA encoded pixels for the selection. A yet another stream is being used to select a particular strand from the DNA strands. To create the diffusion effects, an XOR operation has been done between the DNA encoded image after the swapping of strands and the DNA encoded key image. Finally, the last and ninth stream has been used to decode the DNA-encoded pixels into the decimal form. Purely random numbers with no inter-dependence have been employed in the entire encryption process. The effects of plaintext sensitivity have been achieved through the incorporation of Secure Hash Algorithm-256 or SHA-256 hash codes. In the end, the experiment and the security analysis have been performed. The results of the validation metrics like information entropy(7.9973), average key sensitivity(99.61%) and mean absolute error(84.7158) demonstrate the security, defiance to the number of attacks and a potential for real world application of the proposed image cipher.
Highlights
With the widespread use of information processing gadgets and communication channels, the entire way of living of people has been changed
By treating the single Deoxyribonucleic acid (DNA) strand as a basic unit for scrambling, a novel image encryption scheme has been developed in this study
Plethora of image ciphers exist based on the theories of chaos and DNA computing
Summary
With the widespread use of information processing gadgets and communication channels, the entire way of living of people has been changed. Som et al [45] wrote an RGB image cryptosystem using chaotic map and DNA encoding, for instance In this particular image cipher, to permute the pixels’positions, an Arnold cat map was used. An image cryptosystem through the usage of DNA computing and coupled map lattices was written by Wang et al [49] They used SHA-256 hash algorithm to create the plaintext sensitivity. In a yet another study conducted recently by [50], a color image cipher was developed through the usage of DNA operations and spatiotemporal chaotic system In this particular scheme, the color planes were DNA encoded according to the random DNA encoding rules.
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