Research Article
Cryptanalysis and Improvement of Chaos-Based Image Encryption Scheme with Circular Inter-Intra-Pixels Bit-Level Permutation
Table 5
Average correlation coefficients of different algorithms.
| Direction | Algorithm | Ref. [21] | Ref. [22] | Ref. [23] | Original | Improved |
| Horizontal | 0.01236 | 0.01268 | 0.01320 | 0.01177 | 0.00398 | Vertical | 0.00704 | 0.01174 | 0.00778 | 0.00208 | 0.00143 | Diagonal | 0.00502 | 0.02350 | 0.01822 | 0.00322 | 0.00415 |
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