A Secure Image Encryption Algorithm Based on Rubik's Cube Principle

Table 3

Correlation coefficients between adjacent pairs of pixels for original and encrypted images.

Correlation	Horizontal	Vertical	Diagonal
Original image: lena	0.9763	0.9453	0.9282
Encrypted image: lena	0.0068	0.0091	0.0063
Original image: black	1.0000	1.0000	1.0000
Encrypted image: black	0.0046	0.0055	0.0056
Original image: baboon	0.8567	0.8772	0.7880
Encrypted image: baboon	0.0055	0.0078	0.0042
Original image: checkerboard	0.9578	0.9521	0.9118
Encrypted image: checkerboard	0.0039	0.0090	0.0045