Table 7: MSE between original images and the decrypted versions under cropping attack.

Image Center cropping Sides cropping

Lena 2 . 9 6 × 1 0 3 2 . 9 0 × 1 0 3
Black 2 . 7 2 × 1 0 3 2 . 6 9 × 1 0 3
Baboon 2 . 0 5 × 1 0 3 2 . 0 2 × 1 0 3
Checkerboard 1 . 8 1 × 1 0 4 1 . 6 4 × 1 0 4