Pixel scattering matrix formalism for image encryption—A key scheduled substitution and diffusion approach

The significance of cipher communication against hackers has been strongly felt by the cyber lawmakers. In this direction a yet another double-edged knife cipher methodology employing image encryption (first edge) and multilayered cryptic key (second edge) has been proposed. In this paper, a rapid key encryption procedure employing symmetric key adopting matrix array was practiced. A complex and multilayered key generation scheme employing pseudorandom sequence, DCT, quantization and scrambling was adapted. The operations like diffusion and substitutions were inherently inducted in the proposed scheme to provide faster convergence of cipher image. The effectiveness of the proposed scheme was verified by performing security analysis and also metrics evaluation. Further the present results were compared with the available results and the merits of the same have been highlighted.