90 lines
2.6 KiB
Python
90 lines
2.6 KiB
Python
import string
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def generer_matrice():
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alphabet = string.ascii_uppercase
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matrice = []
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for i in range(len(alphabet)):
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ligne = alphabet[i:] + alphabet[:i]
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matrice.append(list(ligne))
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return matrice
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def afficher_matrice(matrice):
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print("\nMatrice de Vigenère :")
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print(" " + " ".join(string.ascii_uppercase))
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for i, ligne in enumerate(matrice):
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print(f"{string.ascii_uppercase[i]}: {' '.join(ligne)}")
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print()
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def normaliser_texte(texte):
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return "".join([c.upper() for c in texte if c.isalpha() or c == " "])
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def etendre_clef(clef, texte):
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clef = clef.replace(" ", "").upper()
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resultat = ""
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index_clef = 0
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for c in texte:
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if c == " ":
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resultat += " "
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else:
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resultat += clef[index_clef % len(clef)]
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index_clef += 1
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return resultat
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def chiffrer(message, clef, matrice):
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message = normaliser_texte(message)
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clef_etendue = etendre_clef(clef, message)
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alphabet = string.ascii_uppercase
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message_chiffre = ""
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for m, k in zip(message, clef_etendue):
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if m == " ":
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message_chiffre += " "
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else:
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ligne = alphabet.index(k)
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colonne = alphabet.index(m)
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message_chiffre += matrice[ligne][colonne]
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return message_chiffre
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def dechiffrer(message_chiffre, clef, matrice):
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clef_etendue = etendre_clef(clef, message_chiffre)
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alphabet = string.ascii_uppercase
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message_clair = ""
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for c, k in zip(message_chiffre, clef_etendue):
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if c == " ":
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message_clair += " "
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else:
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ligne = alphabet.index(k)
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colonne = matrice[ligne].index(c)
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message_clair += alphabet[colonne]
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return message_clair
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def main():
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matrice = generer_matrice()
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afficher_matrice(matrice)
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while True:
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choix = input("Choisissez une opération ([C]hiffrer / [D]échiffrer / [Q]uitter) : ").upper()
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if choix == "Q":
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print("Au revoir !")
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break
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elif choix not in ["C", "D"]:
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print("Choix invalide, réessayez.")
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continue
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message = input("Entrez le message : ")
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clef = input("Entrez la clé (4 à 16 caractères) : ")
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if not (4 <= len(clef) <= 16):
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print("La clé doit contenir entre 4 et 16 caractères.")
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continue
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if choix == "C":
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resultat = chiffrer(message, clef, matrice)
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print("\nMessage chiffré :", resultat, "\n")
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else:
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resultat = dechiffrer(message, clef, matrice)
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print("\nMessage déchiffré :", resultat, "\n")
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if __name__ == "__main__":
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main()
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