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Spectre
2025-03-18 15:38:06 +01:00
parent 5000d0f183
commit 044de5fb17
1 changed files with 12 additions and 12 deletions
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24
crypto/algo.py
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@@ -1,6 +1,5 @@
from math import gcd
def est_premier(n): def est_premier(n):
"""Vérifie si un nombre est premier."""
if n < 2: if n < 2:
return False return False
for i in range(2, int(n**0.5) + 1): for i in range(2, int(n**0.5) + 1):
@@ -28,7 +27,7 @@ def inverse(e, n):
t, newt = newt, t - quotient * newt t, newt = newt, t - quotient * newt
r, newr = newr, r - quotient * newr r, newr = newr, r - quotient * newr
if r > 1: if r > 1:
raise ValueError("L'inverse modulaire n'existe pas") raise ValueError("L'inverse modulaire n'existe pas.")
if t < 0: if t < 0:
t += n t += n
return t return t
@@ -44,19 +43,20 @@ def dechiffre(d, N, liste):
def liste_en_chaine(liste): def liste_en_chaine(liste):
return ''.join(chr(x) for x in liste) return ''.join(chr(x) for x in liste)
cle = 17873
a, b = 61, 53 a, b = 61, 53
N = a * b N = a * b
phi = (a - 1) * (b - 1) phi = (a - 1) * (b - 1)
e = 17 e = 18607
print(N)
d = inverse(e, phi) d = inverse(e, phi)
cle = 29987
l = [18802, 561, 13389, 1494, 561, 8038, 2177, 9098, 14888, 9098, 12143, 561, 8038, 12143, 9098, 2925, 19036, 9098, 26542, 561, 13389, 468, 19036, 20236] message = "「有時，沒有人期待能做出什麼的人，卻完成了沒有人能想像的事。」"
message_dechiffre = dechiffre(cle, N, l) message_code = chaine_en_liste(message)
message_chiffre = chiffre(e, N, message_code)
message_dechiffre = dechiffre(d, N, message_chiffre)
message_final = liste_en_chaine(message_dechiffre) message_final = liste_en_chaine(message_dechiffre)
print("Message initial:", message)
print("Message chiffré:", message_chiffre)
print("Message déchiffré:", message_final) print("Message déchiffré:", message_final)