The speakers go in depth about the methods of destructions of the Five Eyes. Once source is a Guardian laptop which contained classified material, for which the GCHQ agents insisted to witness/enforce the destruction. Trackpad chip, battery controller, CPU, the agents had a laundry list of components to destroy and tick off.<p>The most interesting slide to me is that a top secret document remains secret if shredded pieces are larger than 12mm, and decrease is classification until they're declassified at 3mm.<p>Fun part is one sysadmin who had to destroy brand new iPhones of government officials because they plugged it on a classified network for less than a minute. It matches my lightening talk on civil intelligence: When there's a wire, they're compromised. On the other hands, are we really governed by officials who plug their iPhones on secret networks?<p>The take away for me is: Even GCHQ gave up the hope of securing computers. If you're a big target, everything is infected. But they still believe in airgaps.