--- a/handouts/ho05.tex	Sun Oct 19 00:41:51 2014 +0100
+++ b/handouts/ho05.tex	Sun Oct 19 14:00:28 2014 +0100
@@ -30,6 +30,9 @@
 
 Keyfobs - protocol
 
+{\small
+\url{http://www.cs.ru.nl/~rverdult/Gone_in_360_Seconds_Hijacking_with_Hitag2-USENIX_2012.pdf}}
+
 attack such protocols because they use weak ciphers (Oyster
 card)