Dan's Brain

Feistel Cipher


For the singular step, with a broader view:

The most important parts of this approach:

  • number of rounds
    • more rounds = harder cryptanalysis
  • design of the function \(F\)
    • best if nonlinear
    • should have good avalanche properties
      • strict avalanche criterion - SAC
      • bit independence criterion - BIC
  • key schedule algorithm

Links to this note