Add barrier type. Transition into playing phase properly.

whitepaper/Dissertation.tex

@@ -236,7 +236,17 @@ RSA blinding can incur a security risk, as by using the same keys to sign and en
 
 \section{Implementation}
 
-The implementation provided uses WebSockets as the communication primitive. Whilst this is therefore a centralised implementation, no verification occurs in the server code, which instead simply "echoes" messages received to all connected clients.
+The implementation provided uses WebSockets as the communication primitive. This is therefore a centralised implementation. However, no verification occurs in the server code, which instead simply "echoes" messages received to all connected clients.
+
+Despite this approach being centralised, it does emulate a fully peer-to-peer environment, and has notable benefits: \begin{itemize}
+    \item It is faster to develop, use, and test than using a physical system such as mail;
+    \item There is no need for hole-punching or port-forwarding;
+    \item WebSockets are highly flexible in how data is structured and interpreted.
+\end{itemize}
+
+In particular, the final point allows for the use of purely JSON messages, which are readily parsed and processed by the client-side JavaScript.
+
+
 
 \bibliography{Dissertation}