[Retracted] Medical Image Encryption Based on 2D Zigzag Confusion and Dynamic Diffusion

Table 1

Correlation coefficient of the original images and its encrypted image.

Images	Direction	Correlation coefficient
		Original image	Encrypted image
CT (512 × 512)	Horizontal	0.9809	0.0012
	Vertical	0.9597	−1.8721e-04
	Diagonal	0.9493	4.3539e-04
MRI (512 × 512)	Horizontal	0.9913	0.0027
	Vertical	0.9907	−4.8855e-04
	Diagonal	0.9829	−7.9588e-04
Ultrasound (512 × 512)	Horizontal	0.9966	3.4296e-04
	Vertical	0.9889	6.9743e-04
	Diagonal	0.9858	8.5018e-04
X-ray (1024 × 1024)	Horizontal	0.9956	−1.7713e-04
	Vertical	0.9944	0.0015
	Diagonal	0.9914	0.0016
CT-kidney (1024 × 1024)	Horizontal	0.9984	−0.0009
	Vertical	0.9987	−0.0017
	Diagonal	0.9972	0.0006