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cesar/chiffrement.py

@@ -0,0 +1,30 @@
+import string
+
+def load_file():
+    with open("message.txt", "r", encoding="utf-8") as f:
+        content = f.read()
+    return content
+
+lower_case = string.ascii_lowercase
+upper_case = string.ascii_uppercase
+
+def dechiffrer(content, step):
+    resultat = ""
+
+    for char in content:
+        if char in lower_case:
+            index = (lower_case.index(char) - step) % 26
+            resultat += lower_case[index]
+        elif char in upper_case:
+            index = (upper_case.index(char) - step) % 26
+            resultat += upper_case[index]
+        else:
+            resultat += char
+
+    return resultat
+
+contenu = load_file()
+texte_dechiffre = dechiffrer(contenu, step=17)
+
+print("Texte déchiffré :")
+print(texte_dechiffre)