Add Tor section

defences.tex

@@ -277,9 +277,31 @@ tracking that relies on third party requests. As soon as a first party performs
 the same tracking that the third party does, blacklists do not provide any
 protection.
 
-\subsection{TOR}
+\subsection{Tor}
 \label{subsec:tor}
 
+Tor is an open source project aimed at providing secure, anonymous
+communication. Its main component is a network of community-hosted relays that
+route traffic through several nodes to the destination. The second component is
+the \emph{Tor Browser}, which is a modified version of the Firefox browser and
+is preconfigured for access to the Tor network. The name stems from the original
+acronym TOR which is short for \emph{The Onion Router}. The non-profit
+organization \emph{The Tor Project} is the main entity behind the software.
+
+Before a request to a server is tunneled through the Tor network, it is
+encrypted in multiple layers using symmetric cryptography, to avoid revealing
+the contents to intermediaries. Only the last node (exit node) is able to view
+the contents, provided that the original request was not encrypted with
+\gls{TLS} or otherwise before handing it over to the Tor network. The route
+within the network is selected based on multiple parameters such as bandwidth
+requirements, state of the network and weights given to individual relays
+\cite{dingledineTorProtocolSpecifications}. Additionally, the exit relay is
+changed periodically to limit user profiling based on \gls{IP} addresses.
+
+The Tor browser is of main interest for users wanting to enhance their privacy
+online. By default, the browser history is not kept and cookies are cleared
+either upon exit or requesting a new identity.
+
 \subsection{Virtual Private Networks}
 \label{subsec:virtual private networks}
 

references.bib

@@ -358,6 +358,13 @@
   journal = {Proc. 2019 Netw. Distrib. Syst. Secur. Symp.}
 }
 
+@misc{dingledineTorProtocolSpecifications,
+  title = {Tor's Protocol Specifications - {{Path Specification}}},
+  author = {Dingledine, Roger and Mathewson, Nick},
+  url = {https://gitweb.torproject.org/torspec.git/tree/path-spec.txt},
+  urldate = {2020-07-14}
+}
+
 @misc{DuckDuckGoa,
   title = {{{DuckDuckGo}}},
   url = {https://duckduckgo.com/},