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

Algorithm 6

Inverse shift column.

	Input: shifted state matrix of size 4 ∗ 4 of bytes
	Output: state matrix of size 4 ∗ 4 of bytes
	a[3, 0], a[0, 0], a[1, 0], a[2, 0] = a[0, 0], a[0, 1], a[0, 2], a[0, 3]
	a[1, 1], a[2, 1], a[3, 1], a[0, 1] = a[0, 1], a[1, 1], a[2, 1], a[3, 1]
	a[2, 2], a[3, 2], a[0, 2], a[1, 2] = a[0, 2], a[1, 2], a[2, 2], a[3, 2]
	a[1, 3], a[2, 3], a[3, 3], a[0, 3] = a[0, 3], a[1, 3], a[2, 3], a[3, 3]