Image Encryption Using a Lightweight Stream Encryption Algorithm

Table 3

Correlation coefficient results of encrypted images. Grayscale type with 256 × 256 size.

File name	File description	Neighborhood of horizontal			Neighborhood of vertical			Neighborhood of diagonal
		The proposed algorithm	A5/1	W7	The proposed algorithm	A5/1	W7	The proposed algorithm	A5/1	W7
4.2.04	Girl (Lena)	−0.0074	−0.0072	−0.0012	0.0072	−0.0522	−0.0122	0.0105	0.0131	0.0017
5.1.12	Clock	0.0320	−0.0130	0.0236	0.0068	−0.0230	0.0220	−0.0840	0.0015	0.0057
5.1.13	Resolution chart	−0.0042	−0.0311	0.0076	0.0196	0.0180	−0.0033	0.0166	−0.0064	0.0196
5.1.14	Chemical plant	−0.0132	0.0177	0.0221	0.0186	−0.0165	0.0364	0.0162	0.0038	−0.0099
5.2.08	Couple	−0.0048	0.0194	0.0227	−0.0149	0.0322	0.0205	0.0149	−0.0052	0.0131
5.2.09	Aerial	0.0094	0.0053	0.0083	−0.0218	0.0098	0.0178	0.0116	−0.0128	0.0184
5.2.10	Stream and bridge	−0.0015	0.0196	0.0017	−0.0357	0.0234	−0.0194	−0.0114	0.0067	−0.0034
5.3.01	Man	−0.0144	0.0084	−0.0402	0.0285	−0.0059	0.0099	−0.0067	0.0085	0.0175
5.3.02	Airport	0.0088	0.0131	0.0166	0.0029	−0.0153	0.0179	0.0196	−0.0223	−0.0182