\subsubsection{PPTP}
-PPTP is broken, Microsoft recommends to ``use a more secure VPN
+PPTP is considered insecure, Microsoft recommends to ``use a more secure VPN
tunnel''\footnote{\url{http://technet.microsoft.com/en-us/security/advisory/2743314}}.
There is a cloud service that cracks the underlying MS-CHAPv2
authentication protocol for the price of USD~200\footnote{\url{https://www.cloudcracker.com/blog/2012/07/29/cracking-ms-chap-v2/}},
-and given the resulting MD4 hash, all PPTP traffic for that user can
+and given the resulting MD4 hash, all PPTP traffic for a user can
be decrypted.
\subsubsection{Cisco IPSec}