Table 4 NL of the proposed work over QI.

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

S-boxes

\(\:{\varvec{f}}_{1}\)

\(\:{\varvec{f}}_{2}\)

\(\:{\varvec{f}}_{3}\)

\(\:{\varvec{f}}_{4}\)

\(\:{\varvec{f}}_{5}\)

\(\:{\varvec{f}}_{6}\)

\(\:{\varvec{f}}_{7}\)

\(\:{\varvec{f}}_{8}\)

\(\:{\varvec{S}}_{1}\)

108.0

110.0

106.0

108.0

108.0

104.0

104.0

108.0

\(\:{\varvec{S}}_{2}\)

108.0

106.0

106.0

108.0

106.0

102.0

108.0

110.0

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