Table 6: MSE between original images and the decrypted versions under different noise attacks.

ImageSalt and pepper noiseSpeckle noise
Density MSE Variance MSE

Lena 0.05 3 . 4 2 × 1 0 3 0.05 5 . 3 0 × 1 0 3
0.1 3 . 6 8 × 1 0 3 0.1 5 . 7 9 × 1 0 3

Black 0.05 1 . 0 6 × 1 0 3 0.05 8 . 1 1 × 1 0 3
0.1 2 . 2 0 × 1 0 3 0.1 1 . 0 2 × 1 0 4

Baboon 0.05 2 . 3 8 × 1 0 3 0.05 3 . 9 7 × 1 0 3
0.1 2 . 4 9 × 1 0 3 0.1 4 . 5 0 × 1 0 3

Checkerboard 0.05 2 . 4 4 × 1 0 4 0.05 2 . 1 2 × 1 0 4
0.1 2 . 5 0 × 1 0 4 0.1 2 . 1 9 × 1 0 4