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Right, the NSA has a bunch of anti-Tor tools that usually are called QUANTUM-whatever. However, correlation of people across different networks is something that XKEYSCORE does. There's also the writing deanonymisation tools that you mention (but there's Anonymouth[1] which could help).

My original point was that OPSEC is hard if you're trying to be a topic expert in a short period of time. You don't need NSA tools to attack someone in that situation.

[1]: https://github.com/psal/anonymouth

In particular, this part:

> It seems that it could be made trivial to narrow down lists of suspects by crunching large data sets that contain stuff like SO questions, AC posts on Slashdot, or responses on HN.

Is what XKEYSCORE does (or at least, it's the interface you use to query the above data sets which are collected as part of PRISM and the other programs).

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