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Title: Very interesting, well researched, quite technical
Review: This pamphlet is very thoroughly researched and contains the details of how the cipher machine worked and how the cipher was broken, from hand methods up to Colossus. If you are not used to thinking about binary logic then the details of the decryption might be very difficult to understand. However the content is fascinating because it reveals the very first stages in the development of the computer: from mechanical, through relays, then valves, all in a few years, but not yet quite with the idea of the stored program (the program was set by using switches and plugs, hard-coding the machine for each task). It even includes some circuit diagrams, though it doesn't matter if you can't understand them (if you can, they're fascinating, honest!) The pamphlet is obviously self-published and in places could do with some review.
