Analytic Study of a Novel Color Image Encryption Method Based on the Chaos System and Color Codes

Algorithm 2

(Key mixing with color codes).

	Input. Permuted array PM, , where ,, and are any three random secret colors in format and k is any random integer, such that
Output. An array Q of order L
Step 1. Computing self-invertible matrix
(a)	Make a matrix of order 3 × 3 as
(b)	Take a random integer , such that
(c)	Calculate
	where is the identity matrix.
(d)	Form a 6 × 6 self-invertible matrix as
	Step 2. Making submatrices
(a)	Convert one-dimensional array PM into submatrices of order. The matrix is , where
(b)	Key mixing is performed using the subsequent formula of Hill cipher
(c)	Concatenate all the ’s in the form of one-dimensional array again as  .