diff --git a/implementation.py b/implementation.py
new file mode 100644
index 0000000..ff6c862
--- /dev/null
+++ b/implementation.py
@@ -0,0 +1,30 @@
+import random
+
+def encode(al, key, msg):
+	tmp = '';
+	hash = '';
+	for i in range(0, len(msg)): # parcourt chaque caractere du message
+		tmp = msg[i]
+		for j in range(1, len(al)): # parcourt les alphabets du premier au dernier
+			tmp = al[j][ al[j-1].index(tmp) ];
+		hash += tmp
+	return hash;
+	
+alphabet = [];
+alphabet.append( ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'] )
+alphabet.append( ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'] )
+alphabet.append( ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'] )
+
+for i in range(0, len(alphabet)):
+	random.shuffle( alphabet[i] );
+	print alphabet[i]
+print 
+
+code = raw_input("Votre message: ")
+# demande la saisie des cles (positions initiales)
+key = [0,0,0,0];
+for i in range(0, len(key)):
+	key[i] = raw_input('Cle n%d : ' % (i+1) )
+	
+
+print encode(alphabet, key, code);