Yeah, this is pretty geeky. If you’ve ever been interested in Cryptography (the study of crytograms - or code making / breaking) then this will be really useful to you. But then as children I think we were all interested in spies and spying - and even more so if you were a boy - so I think anyone can benefit. I still have the PGP manual written by Simson Garfinkel and published by O’Reilly which I must have read it 5 or 6 times, just because the history and the technology is so interesting. Have a look - I may also, over the next day or so download the book and offer it on my website, along with the copyright notices. [SHOW ME]