Original: See also Substitution-permutation network References Claude E. Shannon, "Communication Theory of Secrecy Systems", Bell System Technical Journal, vol.28-4, page 656 - 715, 1949.
Simplified: Other pages Substitution-permutation network References Claude E. Shannon, "Communication Theory of Secrecy Systems", Bell System Technical Journal, vol.28-4, page 656 - 715, 1949.