An investigation by the German broadcasters ARD and WDR has apparently demonstrated the targeting by the NSA of a German student called Sebastian Hahn, who runs a node on the anonymization network Tor. It has also shown that anyone searching for “privacy-enhancing software tools” online may be marked for surveillance. Tor works by bouncing traffic off a series of servers so that it’s near-impossible to trace who’s browsing what. It’s partly funded by the U.S. Department of State because it’s handy for dissidents in repressive regimes, but Edward Snowden’s leaks already showed last year that the NSA has been targeting Tor because it believes terrorists also use it.