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Published 14:55 11 Apr 2015 BST
Updated 21:08 11 Apr 2015 BST

"Bad passwords are one of the easiest ways to compromise a system," he told British comedian John Oliver for the Last Week Tonight show.
"For someone who has a common eight-character password, it can literally take less than a second for a computer to go through the possibilities and pull a password out."
Rather strangely he suggests 'MargaretThatcheris110%sexy" as a super secure password...presumably because nobody would ever have that, right?
(David Cameron may be frantically changing his Facebook logins as we speak).
https://www.youtube.com/watch?v=yzGzB-yYKccExplore more on these topics: