How advertisers became the NSA’s best friend
What’s still unclear is whether the NSA is directly hacking Google or using some other way to track these cookies. But while the company is officially keeping quiet, the simple math of cookie tracking makes it likely that the NSA didn’t need any help from Google. Tracking cookies offers the NSA the perfect system for following suspects across the web: it’s pervasive, persistent, and for the most part, it’s still unencrypted. “It solves a bunch of tricky problems for bulk web surveillance that would otherwise be quite difficult,” says Jonathan Mayer, a fellow at Stanford’s Center for Internet and Society who worked with the Washington Post on the report. The right cookie will follow you as your phone moves from 3G to a coffee shop’s Wi-Fi network, and in many cases it’ll broadcast your unique ID in plain text.
http://www.theverge.com/2013/12/12/5204196/how-advertisers-became-the-nsa-best-friend