Research Article
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 |
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