Novel Image Encryption Scheme Based on Chebyshev Polynomial and Duffing Map

Table 6

Horizontal, vertical and diagonal correlation coefficients of adjacent pixels in plain images and encrypted images.

File name	Plain image correlation			Encrypted image correlation
	Horizontal	Vertical	Diagonal	Horizontal	Vertical	Diagonal
4.1.01	0.956725	0.952503	0.937836	0.001274	0.001785	0.003044
4.1.02	0.908923	0.944135	0.889084	−0.007292	0.007162	0.004493
4.1.03	0.970861	0.916864	0.895799	−0.005882	−0.004236	0.002140
4.1.04	0.956759	0.964448	0.930833	−0.004143	−0.006414	0.008894
4.1.05	0.982138	0.974908	0.962532	0.005939	−0.001269	−0.002035
4.1.06	0.959183	0.934498	0.926566	0.003809	0.011929	−0.002274
4.1.07	0.988603	0.987932	0.979855	−0.008391	0.001379	−0.000308
4.1.08	0.977248	0.979839	0.958275	0.000991	−0.000089	−0.002968
4.2.01	0.978507	0.970863	0.964947	0.001250	−0.000860	0.001454
4.2.02	0.896888	0.909936	0.863983	0.000449	0.001230	−0.000765
4.2.03	0.907119	0.877498	0.839639	−0.001320	−0.000628	−0.000366
4.2.04	0.933223	0.958036	0.918587	−0.004386	0.000342	0.000569
4.2.05	0.962496	0.915378	0.914867	0.004689	0.000547	0.000136
4.2.06	0.969769	0.968659	0.953038	0.000850	0.005358	0.003821
4.2.07	0.964885	0.961169	0.948114	0.001554	−0.001897	0.002504
House	0.975076	0.959036	0.944382	0.001099	−0.002301	0.001799