diff --git a/rootme/challenges/cryptanalyse/otp-erreur-implementation/break.py b/rootme/challenges/cryptanalyse/otp-erreur-implementation/break.py
new file mode 100644
index 0000000..7dfa31f
--- /dev/null
+++ b/rootme/challenges/cryptanalyse/otp-erreur-implementation/break.py
@@ -0,0 +1,27 @@
+#!/usr/bin/python3
+
+import socket
+import base64
+
+conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+conn.connect(("challenge01.root-me.org", 51009))
+
+stat = [None]*42
+for i in range(42):
+	stat[i] = [0]*256
+
+conn.recv(2048).decode()
+
+for k in range(4000):
+	conn.send(b'flag\n')
+	b64cipher = conn.recv(2048).decode()[17:73]
+	cipher = base64.b64decode(b64cipher)
+	for i in range(42):
+		stat[i][cipher[i]] += 1
+conn.close()
+
+for i in range(42):
+	for j in range(256):
+		if stat[i][j] == 0:
+			print(chr(j), end="")
+print("")