An Image Encryption Algorithm Based on a New Hybrid Power Exponent Chaotic System

Table 3

Correlation coefficient.

Image	Horizontal direction	Vertical direction	Diagonal direction
Lena plaintext	0.9385	0.9682	0.9129
Lena ciphered	0.0022	−0.0002	0.0044
Ref. [32] plaintext	0.9718	0.9526	0.9419
Ref. [32] ciphered	0.0020	0.0052	0.0069
Ref. [33] plaintext	0.9876	0.9760	0.9626
Ref. [33] ciphered	−0.0010	−0.0059	0.0072