Research Article
An Image Encryption Algorithm Based on Hyperchaotic System and Variable-Step Josephus Problem
Table 4
The NPCRs and UACIs for differential attack analysis.
| Images | NPCR | UACI |
| Cameraman 128128 | 99.6216 | 33.2842 | Cameraman 256256 | 99.6109 | 33.3735 | Cameraman 512512 | 99.5941 | 33.4795 | Brain 128128 | 99.5544 | 33.3126 | Brain 256256 | 99.5789 | 33.3460 | Brain 512512 | 99.6094 | 33.4677 | White 128128 | 99.6033 | 33.7762 | White 256256 | 99.6506 | 33.4553 | White 512512 | 99.6109 | 33.5130 |
|
|