Research Article
An Image Encryption Algorithm Based on Hyperchaotic System and Variable-Step Josephus Problem
Table 11
Performance comparisons with the existing methods for cameraman image in size 256
256.
| Method | NPCR (%) | UACI (%) | Entropy | Correlations | Horizontal | Vertical | Diagonal |
| [24] | 99.5590 | 33.4439 | 7.9971 | 0.0047 | −0.0066 | 0.0031 | [28] | 99.6047 | 33.5050 | 7.9963 | −0.0074 | 0.0069 | −0.0191 | [31] | 99.5620 | 31.1169 | — | 0.0002 | 0.0027 | 0.0031 | [17] | 99.60 | 33.4495 | 7.9031 | 0.0094 | 0.0023 | −0.0031 | [32] | 99.6445 | 33.6711 | 7.9975 | 0.0072 | −0.0113 | −0.0065 | [33] | 99.6124 | 33.6435 | 7.9976 | 0.0010 | −0.0048 | −0.0080 | [34] | 99.6114 | 33.4682 | 7.9972 | 0.0014 | 0.0027 | −0.0004 | Proposed | 99.6109 | 33.3735 | 7.9976 | −0.0046 | 0.0011 | 0.0159 |
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