If anybody's interested I can post the algorithm. Doing it by hand is slow but very secure - and if you are captured you can destroy the key just by shuffling the deck
Key (used to stack the decks): COMSTOCK
Source: CLIMB MOUNT NIITAKA
Ciphertext: TIGBH VHCCK ZMSFC LIDHZ
It's on the web somewhere... I will look for it later today. Bruce Schneier invented it and he has all the info so I will just post a link to his web page.
Thanks Paul. Thanks Jeff. I probably shouldn't be surprised anymore but I really hadn't expected this many forumites to be interested in cryptography. We have khukuris and encryption, I'll bet Dorthy Denning wouldn't be happy.
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