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Eric Eoin Marques, a dual citizen of Ireland and the United States, was extradited to America as he faces federal charges in U.S. District Court in Greenbelt of distributing child pornography.

As details continue to emerge about the two year-investigation into Ross William Ulbricht, an unassuming 29-year-old and alleged founder of the massive online drug market Silk Road, one important piece of information remains cloaked in shadow: How did the FBI find the organization's servers?

As they rushed toward a suburban Utah home with guns drawn, agents knew they were on to a significant figure in the Silk Road online drug bazaar — a major cocaine dealer, perhaps.

The end came quickly for Silk Road, when federal agents crept in to nab the alleged kingpin of the secret $1.2 billion online drug marketplace as he sat at his laptop in the sci-fi section of a San Francisco public library.

The Silk Road case shined a light on the deep underbelly of the web -- exposing many casual Internet users to unfamiliar terms like Deep Web, Tor and Bitcoin. So we asked Johns Hopkins cryptography professor Matthew Green to help break down this shadowy virtual world for our readers.

A web-hosting owner is accused of 'enabling' child porn; well-intentioned services may also be victims of an enforcement action.