diff --git a/rootme/challenges/cryptanalyse/decomposition-pixelisee/run.py b/rootme/challenges/cryptanalyse/decomposition-pixelisee/run.py
index f4f05de..3f9dbee 100644
--- a/rootme/challenges/cryptanalyse/decomposition-pixelisee/run.py
+++ b/rootme/challenges/cryptanalyse/decomposition-pixelisee/run.py
@@ -9,7 +9,7 @@ for line in lines:
 		chunks = line.split("+")
 		for chunk in chunks:
 			s = chunk.split("x")
-			color = "0" if s[0] == "1" else " "
+			color = " " if s[0] == "1" else "#"
 			count = int(s[1])
 			print(color * count, end="")
 		print("")
diff --git a/rootme/challenges/cryptanalyse/elf64-chiffrement-avec-le-pid/exploit.py b/rootme/challenges/cryptanalyse/elf64-chiffrement-avec-le-pid/exploit.py
new file mode 100644
index 0000000..8774636
--- /dev/null
+++ b/rootme/challenges/cryptanalyse/elf64-chiffrement-avec-le-pid/exploit.py
@@ -0,0 +1,9 @@
+#!/usr/bin/python3
+
+import os
+import crypt
+
+f = open("/proc/sys/kernel/ns_last_pid", mode="r")
+pid = int(f.readlines()[0]) + 2
+pidcrypt = crypt.crypt(str(pid), "$1$awesome")
+os.system(f"./ch21 '{pidcrypt}'")