Photograph by Alex Indigo

According to newly published documents, Canadian spies tracked thousands of travelers online for days after they left an unnamed Canadian airport.
This revelation, gleaned from 2012 slides (PDF) provided by whistleblower Edward Snowden, shows that the Communications Security Establishment Canada (CSEC) conducted a real-world test that began with a “single seed Wi-Fi IP address” from an “international airport” and assembled a “set of user IDs seen on network address over two weeks.”
The technique appears to be related to one outlined by University of California San Diego and Microsoft researchers in a 2010 research paper (PDF).
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