I remember reading this article when it was first published and thought it was a fantastic piece of work.
When it was later discovered that the NSA has been doing this for years [0], the extent of their technical prowess really became apparent to me.<p>[0] <a href="https://www.schneier.com/blog/archives/2014/02/swap_nsa_exploi.html" rel="nofollow">https://www.schneier.com/blog/archives/2014/02/swap_nsa_expl...</a>