A novel colour image encryption scheme using dynamic DNA coding, chaotic maps, and SHA-2

• Published in: Multimedia tools and applications Vol. 81; no. 26; pp. 37873 - 37894
• Main Authors: Paul, L. Shane John, Gracias, Carlton, Desai, Anurag, Thanikaiselvan, V., Suba Shanthini, S., Rengarajan, Amirtharajan
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.11.2022; Springer Nature B.V
• Subjects: Algorithms; Ancient languages; Chaos theory; Computer Communication Networks; Computer Science; Data Structures and Information Theory; Diffusion; Encryption; Genetic algorithms; Multimedia; Multimedia Information Systems; Neural networks; Special Purpose and Application-Based Systems; Hyperchaotic maps; Combined logistic-tent map; Image encryption; SHA-2 hash; Zaslavskii map
• ISSN: 1380-7501; 1573-7721
• DOI: 10.1007/s11042-022-13095-5

In this paper, a novel encryption scheme that combines hyperchaotic maps schemes, SHA-2, and a pixel-shifting based on the Zaslavskii map is proposed. The plain image is first scrambled based on values obtained from a 2-D hyperchaotic map. A cover image is then generated using the combined logistic-tent map. A mask image is then created based on a novel bit indexing scheme based on the SHA-2 value of the cover image. DNA encoding is carried out on both images, using a dynamically chosen logistic-tent map. Then diffusion using the exclusive-OR method was executed. Lastly, multiple diffusion operations are carried out to produce the cipher image. By simulational analysis, this proposed scheme has been determined to yield high security. The proposed method supersedes the previously developed method by the authors.