In this amusing story of a terrorist plotter using pencil-and-paper cryptography instead of actually secure cryptography, there's this great paragraph: Despite urging by the Yemen-based al Qaida leader Anwar Al Anlaki, Karim also rejected the use of a sophisticated code program called "Mujhaddin Secrets", which implements all the AES candidate cyphers, "because 'kaffirs', or non-believers, know about it so it must be less secure".

via How Peer Review Doesn't Work