--- a/handouts/ho05.tex	Fri May 06 13:15:08 2016 +0100
+++ b/handouts/ho05.tex	Wed Jun 01 13:04:21 2016 +0100
@@ -8,6 +8,8 @@
 %% the expectation is that anything encrypted today, will be
 %% decrypted in 20 years time
 
+%http://www.net.in.tum.de/fileadmin/TUM/teaching/netzsicherheit/ws1516/07_PKI.pdf
+
 \section*{Handout 5 (Protocols)}
 
 Protocols are the computer science equivalent to fractals and