FPGA Implementation of Improved Security Approach for Medical Image Encryption and Decryption

Table 6

ρ values of original image and its corresponding encrypted image with chaos-MAES.

Image	Status	Horizontal			Vertical			Diagonal
		Red	Green	Blue	Red	Green	Blue	Red	Green	Blue
Lena	Plain	0.989	0.984	0.957	0.979	0.966	0.935	0.967	0.952	0.918
	Cipher	0.0007	−0.001	−0.0006	−0.015	−0.008	0.0019	−0.025	0.015	0.0105
Peppers	Plain	0.969	0.976	0.948	0.963	0.973	0.952	0.950	0.965	0.921
	Cipher	−0.036	0.003	−0.034	0.001	−0.068	−0.007	0.013	0.002	0.006
Baboon	Plain	0.914	0.967	0.983	0.902	0.984	0.991	0.950	0.950	0.913
	Cipher	0.007	0.002	−0.082	−0.015	−0.002	−0.042	0.0019	−0.032	−0.035
Ultrasound	Plain	0.898	0.900	0.836	0.972	0.972	0.959	0.978	0.981	0.966
	Cipher	−0.002	−0.001	−0.009	−0.004	−0.003	−0.001	−0.002	−0.003	−0.002
Scanner ankle	Plain	0.998	0.998	0.996	0.997	0.998	0.995	0.999	0.999	0.998
	Cipher	−0.005	−0.002	−0.01	−0.031	−0.025	−0.006	−0.002	−0.005	−0.017
Endoscopy	Plain	0.988	0.988	0.988	0.987	0.986	0.987	0.983	0.982	0.982
	Cipher	−0.029	−0.076	−0.094	0.001	−0.007	−0.006	0.001	−0.005	0.021
Radiography foot	Plain	0.998	0.997	0.995	0.999	0.999	0.998	0.999	0.999	0.998
	Cipher	−0.031	−0.005	−0.016	−0.003	−0.003	−0.018	−0.004	−0.010	−0.033
3D X-ray	Plain	0.9981	0.9971	0.9995	0.9995	0.999	0.999	0.9995	0.9986	0.9987
	Cipher	−0.024	−0.016	−0.005	−0.007	0.018	0.003	−0.004	−0.033	−0.010