Hi, I wrote this post - you're right that I should have emphasised the application in security/espionage. With regard to the results, it's very difficult to judge, because in natural language text, even with a low accuracy rate per character people would still be able to deduce the message (see http://www.mrc-cbu.cam.ac.uk/people/matt.davis/cmabridge/) With regard to password cracking, even a low accuracy rate could make a previously impractical brute force search possible,