Exploring the digital jihadist underground on the Onion Router (TOR)
The emergence of the dark web at the beginning of the 21st century is considered to be one of the most significant developments in the history of the digital revolution. What was initially perceived as an experimental and legitimate response to the increased government control over the Internet in time has become a source of a broad spectrum of computer-related crimes. This was mostly caused by the fact that the Onion Router (TOR), Invisible Internet Project (I2P), Freenet or—more recently—ZeroNet provide users with a set of tools enabling anonymous and safe communication. Cybercriminal underground quickly realized that these technologies substantially facilitate the exchange of illicit goods, services, and content. Effectively, the dark web has become an online communication layer known not for the freedom of speech but rather for popular drug markets, firearm vendors, leaked databases, or illegal pornography.