Research Article
Cryptanalysis and Improvement of Chaos-Based Image Encryption Scheme with Circular Inter-Intra-Pixels Bit-Level Permutation
Table 6
Information entropies of different images based on different algorithms.
| | Image | Plain image | Algorithm | | Ref. [21] | Ref. [22] | Ref. [23] | Original | Improved |
| | Lena | 7.4347 | 7.9991 | 7.9951 | 7.9965 | 7.9980 | 7.9963 | | Peppers | 7.5680 | 7.9973 | 7.9965 | 7.9958 | 7.9985 | 7.9985 | | Couple | 7.1685 | 7.9987 | 7.9951 | 7.9980 | 7.9978 | 7.9976 | | Cameraman | 7.0097 | 7.9966 | 7.9955 | 7.9964 | 7.9966 | 7.9985 | | Boat | 7.0944 | 7.9979 | 7.9960 | 7.9959 | 7.9978 | 7.9981 |
| | Mean value | 7.9979 | 7.9956 | 7.9965 | 7.9977 | 7.9978 |
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