An Image Encryption Algorithm Based on Hyperchaotic System and Variable-Step Josephus Problem

Table 14

Test images of USC-SIPI miscellaneous database.

Image	Information entropy	NPCR	UACI	Correlation coefficient
				Horizontal	Vertical	Diagonal	Diagonal
5.1.09	7.99724	99.6399	33.4279	0.0049	0.0116	0.0012	−0.0029
5.1.10	7.99723	99.6048	33.4674	0.0029	0.0030	0.0016	0.0180
5.1.11	7.99653	99.5941	33.4989	−0.0019	0.0090	−0.0018	−0.0094
5.1.12	7.99717	99.5850	33.4592	−0.0267	−0.0017	−0.0018	−0.0012
5.1.13	7.99692	99.6567	33.3297	−0.0013	0.0074	0.0093	−0.0124
5.1.14	7.99761	99.5819	33.5271	0.0072	0.0022	0.0019	0.0026
5.2.08	7.99928	99.6281	33.5026	−0.0026	0.0183	−0.0028	−0.0099
5.2.09	7.99935	99.6181	33.4418	−0.0017	0.0228	0.0177	0.0132
5.2.10	7.99929	99.6098	33.4395	0.0072	0.0131	−0.0072	0.0053
7.1.01	7.99934	99.6208	33.3999	0.0200	−0.0252	−0.0005	0.0198
7.1.02	7.99923	99.5880	33.4919	0.0063	0.0164	−0.0153	0.0212
7.1.03	7.99927	99.6063	33.4398	0.0234	−0.0156	0.0029	0.0358
7.1.04	7.99941	99.6037	33.5254	0.0015	0.0278	0.0150	0.0141
7.1.05	7.99929	99.5987	33.4558	0.0073	0.0027	0.0167	−0.0143
7.1.06	7.99933	99.6014	33.3711	0.0228	−0.0036	−0.0148	−0.0021
7.1.07	7.99922	99.6101	33.4604	0.0021	−0.0022	0.0025	−0.0014
7.1.08	7.99924	99.6159	33.4180	0.0108	−0.0074	−0.0048	0.0103
7.1.09	7.99926	99.6128	33.4841	0.0031	−0.0033	−0.0148	−0.0007
7.1.10	7.99928	99.6056	33.4488	0.0088	−0.0112	0.0056	−0.0012
Boat 0.512	7.99922	99.6407	33.4799	−0.0011	−0.0035	0.0005	−0.0003
Gray 21.512	7.99919	99.6181	33.4631	−0.0047	0.0035	0.0011	0.0024
Ruler 0.512	7.99927	99.6178	33.4648	0.0016	0.0042	0.0021	0.0039