Research Article
A Chaotic Cryptosystem for Images Based on Henon and Arnold Cat Map
Table 10
Calculated UACI and NPCR for different combinations of
and
while
in Peppers.
| | ā | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1 | UACI | 5.1163 | 2.7810 | 2.0331 | 1.1860 | 1.5810 | 6.1305 | 1.4349 | 3.7728 | 3.3215 | 0.0564 | NPCR | 81.5414 | 44.3218 | 32.4032 | 18.9026 | 25.1965 | 97.7051 | 22.8695 | 60.1284 | 52.9366 | 0.8984 | 2 | UACI | 16.2119 | 2.0258 | 0.9736 | 0.4904 | 0.8663 | 32.6779 | 0.4922 | 3.8314 | 4.1271 | 0.1998 | NPCR | 89.1617 | 85.5148 | 81.7390 | 75.0000 | 76.3233 | 94.8944 | 75.3403 | 86.6261 | 89.8193 | 50.9499 | 3 | UACI | 33.3879 | 32.8273 | 34.7519 | 32.7804 | 33.5263 | 33.5459 | 33.3332 | 34.4429 | 33.5705 | 33.2778 | NPCR | 99.6342 | 99.5850 | 99.6552 | 99.5987 | 99.6357 | 99.6017 | 99.6098 | 99.6044 | 99.6033 | 99.5075 | 4 | UACI | 33.4882 | 33.3894 | 33.4144 | 33.4373 | 33.5037 | 33.5170 | 33.4163 | 33.4185 | 33.4494 | 33.5380 | NPCR | 99.6208 | 99.6124 | 99.5979 | 99.5918 | 99.6075 | 99.5892 | 99.6185 | 99.6075 | 99.5960 | 99.5995 | 5 | UACI | 33.3994 | 33.3844 | 33.5083 | 33.4886 | 33.4846 | 33.5354 | 33.4447 | 33.5059 | 33.3940 | 33.4656 | NPCR | 99.6059 | 99.6124 | 99.6258 | 99.6159 | 99.6033 | 99.6067 | 99.6101 | 99.6166 | 99.6120 | 99.5953 | 6 | UACI | 33.4314 | 33.4144 | 33.4623 | 33.3797 | 33.4872 | 33.5663 | 33.4599 | 33.4731 | 33.4311 | 33.4141 | NPCR | 99.6231 | 99.6296 | 99.6250 | 99.6006 | 99.6208 | 99.6265 | 99.6037 | 99.6040 | 99.5926 | 99.6120 | 7 | UACI | 33.4744 | 33.4282 | 33.4541 | 33.5446 | 33.4563 | 33.4700 | 33.4543 | 33.4240 | 33.4748 | 33.4333 | NPCR | 99.5930 | 99.5968 | 99.6128 | 99.6017 | 99.6082 | 99.6021 | 99.6311 | 99.6132 | 99.5964 | 99.6185 | 8 | UACI | 33.4535 | 33.3790 | 33.5941 | 33.5118 | 33.5437 | 33.4958 | 33.5057 | 33.5276 | 33.4622 | 33.4553 | NPCR | 99.6277 | 99.5972 | 99.5758 | 99.6044 | 99.6094 | 99.5983 | 99.6170 | 99.6136 | 99.5888 | 99.5983 | 9 | UACI | 33.4703 | 33.4465 | 33.4612 | 33.5285 | 33.5804 | 33.4783 | 33.4213 | 33.4463 | 33.4063 | 33.4409 | NPCR | 99.5930 | 99.5975 | 99.6006 | 99.6094 | 99.6185 | 99.6262 | 99.5903 | 99.6052 | 99.6082 | 99.6071 | 10 | UACI | 33.4631 | 33.4266 | 33.3962 | 33.4113 | 33.4824 | 33.5212 | 33.5256 | 33.4979 | 33.3891 | 33.4482 | NPCR | 99.6174 | 99.6109 | 99.6178 | 99.6105 | 99.6212 | 99.6071 | 99.5857 | 99.6014 | 99.6071 | 99.5960 |
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