[Retracted] A Secure Environment Using a New Lightweight AES Encryption Algorithm for E-Commerce Websites

Algorithm 7

Inverse zigzag.

	Input: Expanded message (EM) matrix of 4 ∗ 4
	Output: Zigzagged EM matrix of 4 ∗ 4
	Start
	//For the first two column
	While (i + 2 ≤ 3) do
	I = 0, j = 0
	a(i, j) = a(i + 1, j)
	a(i + 1, j) = a(I, j + 1)
	a(I, j + 1) = a(i + 1, j + 1)
	a(i + 1, j + 1) = a(i + 2, j)
	i+=2
	end while
	//For the last two column
	I = 3, j = 3
	While (i − 2) > 0 do
	I = 3, J = 0
	a(i, j) = a(i − 1, j)
	a(i − 1, j) = a(i, j − 1)
	a(i, j − 1) = a(i − 1, j − 1)
	a(i − 1, j − 1) = a(i − 2, j)
	i−=2
	end while
	End