The FBI doesn't reveal how it bypasses Tor to track down the true IP addresses it's designed to obscure.
(One exception was when the US government found itself defending the methods with which agents, without a warrant, managed to pull back the curtain and reveal the location of the hidden website for Silk Road.)
Some observers have suggested that court documents hint at the possibility of the FBI having planted a drive-by installation of some kind of malware to unmask the two men who allegedly possessed child porn.
As Motherboard reports, Stanford computer science and law expert Jonathan Mayer spotted a passage that journalist Nate Raymond had uncovered in the filings and which Mayer says confirms that the FBI deployed malware - what's called a "Network Investigative Technique" in the court filing - to obtain the men's real IP addresses
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