Abstract
In this research article, we have proposed a novel image encryption scheme for the confidentiality of digital information. The modern block ciphers based on confusion and diffusion characteristic, as proposed by Claude Shannon in 1949. Firstly, we have designed a nonlinear confusion component of a block cipher and apply the action of symmetry group S8 to generate a pool of 40,320 substitution boxes with the same cryptographic strength. These nonlinear components are responsible for adding confusion in the encryption algorithm. Secondly, we have utilized a nonlinear chaotic dynamical system to add diffusion capability in our proposed encryption scheme. The suggested scheme is further examined under security performance evaluations, which shows the appropriateness of our offered scheme for digital contents.
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