--- a/hws/hw01.tex	Sat Nov 22 00:46:18 2014 +0000
+++ b/hws/hw01.tex	Sun Nov 23 15:34:32 2014 +0000
@@ -32,6 +32,14 @@
 Think of ways how you can cheat in this exam? How would you defend
 against such cheats.
 
+\item Here is another puzzle where you can practice thinking like an
+  attacker: Consider modern car keys. They wirelessly open and close
+  the central locking system of the car. Whenever you lock the car,
+  the car ``responds'' by flashing the indicator lights. Can you think
+  of a security relevant purpose for that? (Hint: Imagine you are in
+  the business of stealing cars. What attack would be easier to
+  perform if the lights do not flash?)
+
 \item Explain what hashes and salts are. Describe how they can be used
   for ensuring data integrity and storing password information.