quadratic map systems. First, the color image is divided into three components (red (R),
green (G), and blue (B)). The three components are mixed as single grayscale image, to
permute the pixels positions; we have used two permutation index vectors for changing rows
and columns position. Finally, the permuted grayscale image is encrypted. In order to
evaluate the security of the proposed scheme, the entropy, key space analysis, key …