--- a/web/common.php	Mon Nov 25 18:54:00 2013 +0100
+++ b/web/common.php	Mon Nov 25 19:06:54 2013 +0100
@@ -23,6 +23,8 @@
 $C_event_props = __DIR__ . "/event_props";
 $C_event_users = array('polemictweet' => 'polemictweet'.date('Y/m/d'));
 
+$C_openssl_cipher_iv_length = 16; //openssl_cipher_iv_length('aes256')
+
 $archives_list = array(
     "rsln", "rsln-opendata", "rsln-mercedes-bunz",
 	"enmi2011-technologie-confiance", "CPV", array("fens_FabLab_Design_Metadata","fablab"),