Research Article
A Robust and Fast Image Encryption Scheme Based on a Mixing Technique
Table 6
UACI and NPCR values of encrypted images.
| Changed pixel position | [44] (2018) | [37] (2020) | [51] (2020) | Plain image | Metric | First pixel | Middle pixel | Last pixel |
| Cameraman (256 256) | NPCR | 99.62 | 99.61 | 99.62 | — | 99.62 | 99.63 | UACI | 33.54 | 33.55 | 33.53 | — | 33.42 | 33.63 |
| Lena (512 512) | NPCR | 99.62 | 99.62 | 99.61 | 99.61 | 99.63 | 99.62 | UACI | 33.46 | 33.47 | 33.46 | 30.47 | 33.52 | 33.28 |
| Plane (900 600) | NPCR | 99.63 | 99.62 | 99.62 | 99.60 | — | 99.60 | UACI | 33.47 | 33.48 | 33.47 | 32.60 | — | 33.42 |
| Mixture (512 512) | NPCR | 99.61 | 99.61 | 99.61 | — | — | — | UACI | 33.42 | 33.41 | 33.42 | — | — | — |
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