WikiMath

  #-*-coding:utf8-*-
  from random import shuffle
  N = input("Quelle taille pour les blocs ? ")
  key = range(N)
  shuffle(key)
  print "La clé est :",key
  message = raw_input("Quel message chiffrer ? ")

  blocs = [message[N*k:N*(k+1)] for k in range(len(message)/N)]
  crypto = [[blocs[k][u] for u in key] for k in range(len(blocs))]
  print "Cryptogramme :",''.join(sum(crypto,[]))