In addition, to give digital investigators the best chance of obtaining decrypted data in the field, prosecutors need to prepare search warrants with FDE in mind. To address this challenge, there is a pressing need for more effective on-scene capabilities to detect and preserve encryption prior to pulling the plug. The practice of shutting down an evidential computer is not an acceptable technique when dealing with FDE or even volume encryption because it may result in all data on the device being rendered inaccessible for forensic examination. The increasing use of full disk encryption (FDE) can significantly hamper digital investigations, potentially preventing access to all digital evidence in a case. Finally, we report our experience in effectively crawling bridge nodes, supposedly revealed sparingly in Tor. We provide an efficient method allowing an exit node to detect such an abnormal usage. We also show that Tor usage is now diverted from the onion routing concept and that Tor exit nodes are frequently used as 1-hop SOCKS proxies, through a so-called tunneling technique.

We do not only report such usage in terms of traffic size and number of connections but also depict how users behave on top of Tor. Furthermore, this paper provides a deep analysis of both the HTTP and BitTorrent protocols giving a complete overview of their usage. In particular, we quantify the BitTorrent traffic and show that the load of the latter on the Tor network is underestimated because of encrypted BitTorrent traffic (that can go unnoticed). Beyond providing global statistics on the typical usage of Tor in the wild, we show that Tor is actually being is-used, as most of the observed traffic belongs to P2P applications.

Surprisingly, very few researches shed light on such an anonymizing network. Indeed, Tor an example of anonymizing networks based on onion routing concept attracts more and more volunteers, and is now popular among dozens of thousands of Internet users. Anonymizing networks are then poised to become an important service to support anonymous-driven Internet communications and consequently enhance users' privacy protection. Users' anonymity and privacy are among the major concerns of today's Internet.

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