Research Article
An Image Encryption Algorithm Based on Hyperchaotic System and Variable-Step Josephus Problem
Table 6
Entropies of original images and cipher images.
| Images | Entropies | Original images | Cipher images |
| Cameraman 128128 | 6.8794 | 7.9873 | Cameraman 256256 | 6.9046 | 7.9976 | Cameraman 512512 | 6.9102 | 7.9994 | Brain 128128 | 4.9891 | 7.9854 | Brain 256256 | 5.0330 | 7.9971 | Brain 512512 | 5.4498 | 7.9993 | White 128128 | 0 | 7.9891 | White 256256 | 0 | 7.9973 | White 512512 | 0 | 7.9993 | Black 256256 | 0 | 7.9973 |
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