Once they become an entry guard an attacker can examine the stream of data passing through their node or nodes.
To become one an attacker only needs to join the network as a relay, keep their head down and wait. The attack outlined in the paper Circuit Fingerprinting Attacks: Passive Deanonymization of Tor Hidden Services, comes in two parts and is performed from an entry guard – the first computer in circuit.Įntry guard status is bestowed upon relays in the Tor network that offer plenty of bandwidth and demonstrate reliable uptime for a few days or weeks. That’s because between the user and the hidden service there’s a chain of computers, known as a Tor circuit, that uses encryption to hide the two ends of the connection from each other (and anyone trying to eavesdrop). On the Dark Web both the user and the websites they visit are anonymous and neither party knows the true IP address of the other. On the regular web the locations of the websites are public but the Tor user is anonymous. Tor is a sophisticated anonymity tool that can be used for browsing the regular World Wide Web or the so-called Dark Web. New research from MIT (Massachusetts Institute of Technology) shows how malicious Tor entry guards can strip away the Dark Web’s anonymity features, exposing users and the hidden websites they visit.
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