diff --git a/saison-2/sources/espionnage/bordurie/encrypt.py b/saison-2/sources/espionnage/bordurie/encrypt.py
new file mode 100644
index 0000000..62f6ea8
--- /dev/null
+++ b/saison-2/sources/espionnage/bordurie/encrypt.py
@@ -0,0 +1,43 @@
+import sys
+
+
+def rotate(x, y):
+    return (x + y) % 26
+
+
+def shift(letter, n):
+    x = ord(letter) - ord("A")
+    y = rotate(x, n)
+    return chr(ord("A") + y)
+
+
+def rot13(message):
+    message = "".join([x for x in message if x.isalpha()])
+    message = message.upper()
+    res = ""
+    for c in message:
+        res += shift(c, 13)
+    return res
+
+
+def encrypt(key, message):
+    message = "".join([x for x in message if x.isalpha()])
+    message = message.upper()
+    res = ""
+    i = 0
+    for c in message:
+        x = ord(key[i % len(key)]) - ord("A")
+        res += shift(c, x)
+        i += 1
+    return res
+
+
+def main():
+    cle = sys.argv[1]
+    message = sys.argv[2]
+    res = encrypt(cle, message)
+    print(res)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/saison-2/sources/espionnage/bordurie/test_chiffre.py b/saison-2/sources/espionnage/bordurie/test_chiffre.py
new file mode 100644
index 0000000..5178a6e
--- /dev/null
+++ b/saison-2/sources/espionnage/bordurie/test_chiffre.py
@@ -0,0 +1,33 @@
+def rotate(x, y):
+    return (x + y) % 26
+
+
+def shift(letter, n):
+    x = ord(letter) - ord('A')
+    y = rotate(x, n)
+    return chr(ord('A') + y)
+
+
+def rot13(message):
+    message = "".join([x for x in message if x.isalpha()])
+    message = message.upper()
+    res = ""
+    for c in message:
+        res += shift(c, 13)
+    return res
+
+
+def test_rotate():
+    assert rotate(1, 3) == 4
+    assert rotate(25, 3) == 2
+
+
+def test_shift():
+    assert shift('A', 2) == 'C'
+    assert shift('E', 2) == 'G'
+    assert shift('Y', 3) == 'B'
+
+
+def test_rot13():
+    assert rot13('hello') == 'URYYB'
+    assert rot13('URYYB') == 'HELLO'
diff --git a/saison-2/sources/espionnage/notes b/saison-2/sources/espionnage/notes
new file mode 100644
index 0000000..a821ac2
--- /dev/null
+++ b/saison-2/sources/espionnage/notes
@@ -0,0 +1,6 @@
+Message-1 was encrypted with the key 'M'. Decrypt it
+
+Message-2 was encrypted with an unknown, 3 letters key. Decrypt it too,
+knowing that it contains the string 'Plekszy-Gladz'
+
+spoiler: xdr
diff --git a/saison-2/sources/espionnage/syldavie/decrypt.py b/saison-2/sources/espionnage/syldavie/decrypt.py
new file mode 100644
index 0000000..22f7bba
--- /dev/null
+++ b/saison-2/sources/espionnage/syldavie/decrypt.py
@@ -0,0 +1,62 @@
+import sys
+import string
+
+
+def rotate(x, y):
+    return (x - y) % 26
+
+
+def shift(letter, n):
+    x = ord(letter) - ord("A")
+    y = rotate(x, n)
+    return chr(ord("A") + y)
+
+
+def rot13(message):
+    message = "".join([x for x in message if x.isalpha()])
+    message = message.upper()
+    res = ""
+    for c in message:
+        res += shift(c, 13)
+    return res
+
+
+def decrypt(key, message):
+    message = "".join([x for x in message if x.isalpha()])
+    message = message.upper()
+    res = ""
+    i = 0
+    for c in message:
+        x = ord(key[i % len(key)]) - ord("A")
+        res += shift(c, x)
+        i += 1
+    return res
+
+
+def try_with_key(key, message):
+    res = decrypt(key, message)
+    if "PLEKSZYGLADZ" in res:
+        return res
+
+
+def main():
+    message = sys.argv[1]
+    print(decrypt('N', message))
+
+    """
+    message = sys.argv[1]
+    letters = string.ascii_uppercase
+    for a in letters:
+        for b in letters:
+            for c in letters:
+                key = a + b + c
+                res = try_with_key(key, message)
+                if res:
+                    print(res)
+                    print("key:", key)
+                    return
+                    """
+
+
+if __name__ == "__main__":
+    main()
diff --git a/saison-2/sources/espionnage/syldavie/message-1.txt b/saison-2/sources/espionnage/syldavie/message-1.txt
new file mode 100644
index 0000000..0732791
--- /dev/null
+++ b/saison-2/sources/espionnage/syldavie/message-1.txt
@@ -0,0 +1 @@
+GVAGVAFRFGRZCNERQHFCRPGERCERARMYRFZRFHERFARPRFFNVERF
diff --git a/saison-2/sources/espionnage/syldavie/message-2.txt b/saison-2/sources/espionnage/syldavie/message-2.txt
new file mode 100644
index 0000000..413ee11
--- /dev/null
+++ b/saison-2/sources/espionnage/syldavie/message-2.txt
@@ -0,0 +1 @@
+IHDXUVZKRISCBNJWBXIDUWVVODUBPRFQRIRGBUR