An Efficient Lightweight Cryptographic Instructions Set Extension for IoT Device Security

Table 6

Correlation coefficient of two adjacent pixels of plain and ciphered images.

Image		Horizontal	Vertical	Diagonal
Lena	Plain image	0.8857	0.9517	0.8721
	PRESENT ciphered	−9.8017e − 04	−0.0119	−0.0012
	PRINCE ciphered	−0.0072	−0.0016	−0.0017
Pepper	Plain image	0.9599	0.9679	0.9404
	PRESENT ciphered	−0.0156	−0.0013	4.2070e − 04
	PRINCE ciphered	−0.0013	−0.0111	0.0063
Baboon	Plain image	0.8778	0.8342	0.7881
	PRESENT ciphered	−0.0100	−0.0016	0.0076
	PRINCE ciphered	0.0123	0.0039	0.0094
Barbara	Plain image	0.9078	0.9461	0.8835
	PRESENT ciphered	−0.0096	−0.0167	0.0022
	PRINCE ciphered	−0.0072	−0.0016	−0.0017