0
$\begingroup$

What's the difference between substitution and permutation in DES? From my understanding substitution is replacing the data with new data and permutation is just rearranging the data?

$\endgroup$
0
$\begingroup$

You pretty much answered your own question:

  • Substitution replaces a section of data with another chunk of data
  • Transposition moves data from one place to another

Substitution is usually responsible for non-linearity or "confusion", while transposition is useful for "diffusion" and ensuring that changes in one bit propagate to the rest of the state.

| improve this answer | |
$\endgroup$

Not the answer you're looking for? Browse other questions tagged or ask your own question.