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# Untitled

a guest Jun 25th, 2019 67 Never
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1. FILE = "C:/Users/Asus/Desktop/GEDEFU.txt"
2. charset = ["A", "D", "G", "F","V", "X"]
3. french = [" ", "E", "A", "I", "S", "N", "R", "T", "O", "L", "U", "D", "C", "M", "P", "G", "B", "V", "H", "F", "Q", "Y", "X", "K", "W","Z", "1", "9", "6", "2", "8", "3", "4", "5", "7", "0"]
4. clef = "PAHMVIN"
5.
7.     if len(content)%2 != 0:
8.         content += "X"
9.     return content
10.
11. def transposition(key, content):
12.     matrice, transposition = [[0]*373 for i in range(len(key))], [[0]*len(key) for i in range(373)]
13.     tab, dic, inter = list(zip(*[iter(content)]*len(key))), {}, []
14.     i,j = 0, 0
15.     for i in range(len(key)):
16.         for j in range(373):
17.             matrice[i][j] = tab[j][i]
18.     decomp_key = list(key)
19.     decomp_key_al = sorted(decomp_key, reverse=True)
20.     for i in range(len(decomp_key_al)):
21.         dic[decomp_key_al[i]] = matrice[i]
22.     for elt in decomp_key:
23.         inter.append(dic[elt])
24.     for i in range(len(inter)):
25.         for j in range(len(transposition)):
26.             transposition[j][i] = inter[i][j]
27.     return transposition
28.
29. def convertString(array, n, p):
30.     transpo = ""
31.     for i in range(n):
32.         for j in range(p):
33.             transpo += array[j][i]
34.     return transpo
35.
36. def refe(array):
37.     ref, i, j = [], 0, 0
38.     for i in range(len(array)):
39.         for j in range(len(array)):
40.             ref.append(array[i]+array[j])
41.     return ref
42.
43. def getblock(content):
44.     i,solo,block = 0,[], []
46.     solo = list(content)
47.     while i != len(solo):
48.         block.append(solo[i]+solo[i+1])
49.         i += 2
50.     return block
51.
52. def occurence(block, ref): #Calcule la fréquence d'apparition d'une pair de lettres.
53.     i, j, count, res = 0, 0, 0, []
54.     for i in range(len(ref)):
55.         for j in range(len(block)):
56.             if block[j] == ref[i]:
57.                 count += 1
58.         count = round((count*100)/len(block), 2)
59.         res.append(count)
60.         count = 0
61.     return res
62.
63. def liste(ref, frequence, french):  #Créer une liste avec correspondance.
64.     liste , i = [], 0
65.     for i in range(len(ref)):
66.         elt = ref[i]+":"+str(frequence[i])
67.         liste.append(elt)
68.     sub_liste, frequence, i = [], sorted(frequence, reverse=True), 0
69.     for i in range(len(french)):
70.         sub_liste.append(liste[i].replace(liste[i][3:], french[i]))
71.     return sub_liste
72.
73. def substitution(block, liste, ref): #Remplace les lettres dans le texte par les lettres de la frequence de la langue (Etape 1 du chiffrement)
74.     for i in range(len(ref)):
75.         for j in range(len(block)):
76.             if ref[i] == block[j]:
77.                 block[j] = block[j].replace(block[j], liste[i][3:])
78.     return block
79.
80. def convertChar(array):
81.     solve, i = "", 0
82.     for i in range(len(array)):
83.         solve += array[i]
84.     return solve
85.
86.
87. def main():
88.     with open(FILE, "r") as content:
90.         content.close()
92.     message_reverse = transposition(clef, raw)
93.     message_reverse = convertString(message_reverse, len(clef), len(message_reverse))
94.     block = getblock(message_reverse)
95.     reference = refe(charset)
96.     frequence = occurence(block, reference)
97.     correspondance = liste(reference, frequence, french)
98.     array_solve = substitution(block, correspondance, reference)
99.     solve = convertChar(array_solve)
100.     print(len(solve))
101.
102. main()
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