Research Article
A Chaotic Cryptosystem for Images Based on Henon and Arnold Cat Map
Table 13
Calculated UACI and NPCR for different combinations of
and
while
for Cameraman.
| | ā | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1 | UACI | 7.4904 | 2.6620 | 5.1333 | 11.4982 | 3.7695 | 5.6794 | 5.3902 | 11.9543 | 8.4184 | 7.4904 | NPCR | 29.8447 | 10.6064 | 20.4529 | 45.8130 | 15.0192 | 22.6288 | 21.4767 | 47.6303 | 33.5419 | 29.8447 | 2 | UACI | 1.0214 | 0.1943 | 0.4910 | 1.9258 | 0.3592 | 0.5052 | 0.4911 | 1.8747 | 1.0055 | 1.0214 | NPCR | 83.5632 | 49.5514 | 75.0793 | 86.7004 | 63.8062 | 76.2024 | 75.0595 | 84.4025 | 81.1432 | 83.5632 | 3 | UACI | 33.7662 | 29.9298 | 32.1345 | 32.5679 | 33.5877 | 33.5277 | 33.6352 | 34.8690 | 33.6583 | 33.7662 | NPCR | 99.6262 | 99.5071 | 99.5102 | 99.5285 | 99.5224 | 99.5850 | 99.6384 | 99.6552 | 99.6521 | 99.6262 | 4 | UACI | 33.4563 | 33.3303 | 33.4678 | 33.5979 | 33.4952 | 33.5201 | 33.4910 | 33.2905 | 33.3876 | 33.4563 | NPCR | 99.6292 | 99.5453 | 99.5972 | 99.6582 | 99.5972 | 99.6170 | 99.5682 | 99.5743 | 99.6475 | 99.6292 | 5 | UACI | 33.2851 | 33.4706 | 33.3841 | 33.5766 | 33.3711 | 33.4932 | 33.3911 | 33.4998 | 33.4473 | 33.2851 | NPCR | 99.6155 | 99.6262 | 99.5834 | 99.5972 | 99.6109 | 99.5956 | 99.5956 | 99.6368 | 99.6201 | 99.6155 | 6 | UACI | 33.4854 | 33.3612 | 33.6393 | 33.4269 | 33.3583 | 33.6404 | 33.4790 | 33.3590 | 33.2436 | 33.4854 | NPCR | 99.6567 | 99.5911 | 99.5682 | 99.6078 | 99.6277 | 99.5880 | 99.6277 | 99.6124 | 99.6414 | 99.6567 | 7 | UACI | 33.4159 | 33.4013 | 33.5464 | 33.5039 | 33.4404 | 33.4768 | 33.4303 | 33.3951 | 33.2653 | 33.4159 | NPCR | 99.6674 | 99.5850 | 99.6094 | 99.6262 | 99.5880 | 99.6140 | 99.5941 | 99.5850 | 99.6002 | 99.6674 | 8 | UACI | 33.4321 | 33.4036 | 33.6195 | 33.4753 | 33.3993 | 33.5394 | 33.4112 | 33.5314 | 33.4387 | 33.4321 | NPCR | 99.5621 | 99.5926 | 99.6368 | 99.6277 | 99.5895 | 99.5941 | 99.5819 | 99.5987 | 99.6094 | 99.5621 | 9 | UACI | 33.4651 | 33.3438 | 33.4917 | 33.4837 | 33.4551 | 33.4780 | 33.4704 | 33.4806 | 33.4516 | 33.4651 | NPCR | 99.6140 | 99.6323 | 99.5636 | 99.6216 | 99.6429 | 99.6109 | 99.6338 | 99.5758 | 99.6002 | 99.6140 | 10 | UACI | 33.6242 | 33.5821 | 33.2618 | 33.4312 | 33.5802 | 33.6133 | 33.3934 | 33.6385 | 33.5515 | 33.6242 | NPCR | 99.5972 | 99.5895 | 99.6078 | 99.5773 | 99.6033 | 99.5911 | 99.6323 | 99.6109 | 99.5850 | 99.5972 |
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