In the latest NSA leak, published on the German site Tagesschau yesterday, we’re able to glean more about how one of the intelligence agency’s surveillance systems actually works. The “XKeyscore” system, first revealed by the Guardian in July 2013, allows NSA analysts an overview of millions of people’s data: emails, browsing history and social media activity, all stored in databases and accessible without prior authorisation. Conceptually, that’s a very powerful tool. Now an investigation led by Jacob Appelbaum, a security researcher and a member of the team behind the anonymous Tor browser, looks at portions of the source code that dictate what else the system is capable of. The full details, published on German site Das Erste, are dense and well worth …
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