1
$\begingroup$

Can someone give a clear definition of what a perfectly nonlinear function is? Can we say that AES s-boxes are perfectly nonlinear and why?

$\endgroup$
  • 1
    $\begingroup$ see Definition 2 at Perfect nonlinear functions and cryptography $\endgroup$ – kelalaka Oct 26 '18 at 19:11
  • 1
    $\begingroup$ as far as I know, an $m \times m$ boolean function where $m$ is an even number can never be as nonlinear (relative to its size) as when $m$ is an odd number, so an 8x8 boolean function such as the AES s-box (there is only 1) can never be perfectly nonlinear $\endgroup$ – Richie Frame Oct 27 '18 at 0:27

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Browse other questions tagged or ask your own question.