From ec8893a097a6c0fffebd7db9e4a5568a3bf4df47 Mon Sep 17 00:00:00 2001
From: jerome <jerome@xlinfo.fr>
Date: Sun, 12 Oct 2025 17:41:43 +0200
Subject: organisation

---
 crypto/cesar.py | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 crypto/cesar.py

(limited to 'crypto/cesar.py')

diff --git a/crypto/cesar.py b/crypto/cesar.py
new file mode 100644
index 0000000..cc58d8f
--- /dev/null
+++ b/crypto/cesar.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+
+import string
+
+
+def decalage(char, key):
+    liste = list(string.ascii_lowercase)*2 + list(string.ascii_uppercase)*2
+    #print(liste)
+    if char not in liste:
+        return char
+    else:
+        return liste[liste.index(char)+key]
+
+# print(decalage("a",3))
+
+
+print("********************")
+print("Chiffrement de César")
+print("********************")
+
+menu = ["c) Chiffrer un message", "d) Dechiffrer un message", "q) Quitter"]
+
+while True:
+    for choix in menu:
+        print(choix)
+    rep = input("Votre choix : ")
+    match rep.lower():
+        case "c":
+            msgChiffre = str()
+            msg = input("Votre message : ")
+            clef = int(input("Entrez votre clef (entre 1 et 25) : "))
+            for lettre in msg:
+                #msgChiffre = msgChiffre + decalage(lettre,clef)
+                msgChiffre += decalage(lettre, clef)
+            print("\nVotre message chiffré : ", msgChiffre, "\n")
+            print("********************")
+            msg = ""
+            msgChiffre = ""
+        case "d":
+            msg = str()
+            msgChiffre = input("Votre message : ")
+            for clef in range(25,0,-1):
+                for lettre in msgChiffre:
+                    msg += decalage(lettre, clef)
+                print(f"rot{26-clef} : {msg}")
+                msg = ""
+            print("********************")
+        case "q":
+            print("bye")
+            exit()
-- 
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