Research Article

Chaotic Image Encryption Algorithm Based on Circulant Operation

Table 2

NPCR and UACI of two encrypted images with one-bit difference.

Image Size UACI NPCR

Cameraman 0.33589 0.99579
Lena 0.33562 0.99578
Straw 0.33446 0.99594
Gravel 0.33457 0.99594