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Entropy of cyphertext images.
| Images | This Paper | Ref. [34] | Ref. [39] | Ref. [40] | Ref. [41] | Ref. [42] |
|---|---|---|---|---|---|---|
| Rice (256 × 256) | 7.9973 | 7.9864 | 7.9936 | 7.9643 | 7.9875 | 7.9968 |
| cameraman (256 × 256) | 7.9989 | 7.9763 | 7.9952 | 7.9867 | 7.9946 | 7.9865 |
| autumn (206 × 345) | 7.9968 | 7.9564 | 7.9962 | 7.9698 | 7.9864 | 7.9972 |
| pepper (512 × 512) | 7.9992 | 7.9819 | 7.9983 | 7.9949 | 7.9896 | 7.9993 |
