Table 2:
Number of pixel change rate (NPCR) between images encrypted with keys
𝐾
1
and
𝐾
2
(with 1 bit difference).
Image
Mean (%)
Standard deviation (%)
Lena
99.6111
0.0251
Black
99.6064
0.0238
Baboon
99.6085
0.0253
Checkerboard
99.6113
0.0274