diff --git a/src/Bundle/ChillDocStoreBundle/Service/Cryptography/KeyGenerator.php b/src/Bundle/ChillDocStoreBundle/Service/Cryptography/KeyGenerator.php
index 58520b352..9956cbfa7 100644
--- a/src/Bundle/ChillDocStoreBundle/Service/Cryptography/KeyGenerator.php
+++ b/src/Bundle/ChillDocStoreBundle/Service/Cryptography/KeyGenerator.php
@@ -33,7 +33,7 @@ class KeyGenerator
             throw new \LogicException(sprintf("Algorithm '%s' is not supported.", $algo));
         }
 
-        $key = $this->randomizer->getBytes(128);
+        $key = $this->randomizer->getBytes(32);
 
         return [
             'alg' => 'A256CBC',