Ever since the introduction of the internet, it has been void of any privacy.The majority of internet traffic currently is and always has been unencrypted.A number of anonymous communication overlay networks exist whose aim it is toprovide privacy to its users. However, due to the nature of the internet, thereis major difficulty in getting these networks to become both decentralized andanonymous. We list reasons for having anonymous networks, discern the problemsin achieving decentralization and sum up the biggest initiatives in the fieldand their current status. To do so, we use one exemplary network, the Tornetwork. We explain how Tor works, what vulnerabilities this network currentlyhas, and possible attacks that could be used to violate privacy and anonymity.The Tor network is used as a key comparison network in the main part of thereport: a tabular overview of the major anonymous networking technologies inuse today.
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