Research Article
Image Encryption with Double Spiral Scans and Chaotic Maps
Table 4
Entropy comparisons among different algorithms.
| | Image | Original | [6] | [25] | [31] | Our |
| | Lena | 7.2185 | 7.3634 | 7.9974 | 7.9991 | 7.9992 | | Fingerprint | 5.1141 | 6.9960 | 7.9963 | 7.9963 | 7.9964 | | Woman | 6.8981 | 7.4099 | 7.9972 | 7.9986 | 7.9991 | | Lake | 7.7610 | 7.9427 | 7.9985 | 7.9993 | 7.9997 | | Goldhill | 7.5195 | 7.6788 | 7.9984 | 7.9993 | 7.9995 | | ChestXray | 5.8733 | 7.3865 | 7.9991 | 7.9985 | 7.9989 |
| | Average | 6.7308 | 7.4629 | 7.9978 | 7.9985 | 7.9988 |
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