Table 5 NL comparison with existing work.

From: A novel color images security-based on SPN over the residue classes of quaternion integers \(\:\varvec{H}{\left(\mathbb{Z}\right)}_{\varvec{\pi\:}}\)

\(\:\mathbf{S}-\mathbf{b}\mathbf{o}\mathbf{x}\mathbf{e}\mathbf{s}\)

\(\:\mathbf{N}\mathbf{L}\)

S1

107.00

S2

106.75

[6]

106.50

[7]

104.00

[8]

104.00

[9]

106.00

[16]

104.00