A Novel Chaotic Image Encryption Algorithm Based on Latin Square and Random Shift

Algorithm 3

Bit scrambling P_d = diffusion (P, LH₁, LH₂).

	Input: Image matrix P, LH1, and LH2.
	Output: The image Pd after scrambling.
	PA = [bitget (P, 1), bitget (P, 3); bitget (P, 5), bitget (P, 7)]
	PB = [bitget (P, 2), bitget (P, 4); bitget (P, 6), bitget (P, 8)]
	for i = 1: N
	A = PA (i, :)
	B = PB (:, i)
	(i, :) = A (Lh1 (i, :))
	(:, i) = B (Lh2 (:, i))
	end
	for i = 0 : 1: 3 do
	Pd (i) =  (i + 1: N × (i + 1))
	Pd (2i + 1) =  (i + 1: N × (i + 1))
	end