--- a/hws/hw05.tex	Fri Nov 07 14:36:55 2014 +0000
+++ b/hws/hw05.tex	Fri Nov 07 22:13:26 2014 +0000
@@ -79,7 +79,10 @@
 \end{enumerate}
 
 In Step 2 and 4 a message is split into two halves. Explain
-what the purpose of this split is? 
+what the purpose of this split is?  Assume the key $K$ is shared 
+only between the car and the transponder.  Does the protocol 
+achieve that the transponder $T$ authenticates itself to the car
+$C$? Does the car authenticate itself to the transponder?