Research Article
A New Chaos-Based Color Image Encryption Scheme with an Efficient Substitution Keystream Generation Strategy
Table 1
Results of NIST statistical test.
| | Test items | Pass rate | | Proposed method | Conventional method |
| | Frequency | 100.0% | 97.50% | | Block frequency | 99.00% | 99.00% | | Cusum-forward | 100.0% | 97.00% | | Cusum-reverse | 100.0% | 97.50% | | Runs | 99.50% | 98.50% | | Long runs of ones | 99.50% | 97.50% | | Rank | 99.00% | 98.50% | | Spectral DFT | 99.00% | 99.00% | | Nonoverlapping templates | 99.50% | 98.50% | | Overlapping templates | 99.00% | 97.00% | | Universal | 98.50% | 98.00% | | Approximate entropy | 99.00% | 97.50% | | Random excursions | 98.21% | 99.43% | | Random excursions variant | 99.40% | 100.0% | | Linear complexity | 99.50% | 99.50% | | Serial | 99.50% | 99.00% |
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