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@teome
Didn't mean to be so cryptic I just didn't have time to look it up. It's actually Kahn not khan. Rearangement error. I read it years ago and really recommend it. It's called The Codebreakers
http://en.m.wikipedia.org/wiki/David_Kahn_(writer)
A very good basic/mid-level overview of cryptography I read is
By Simon Singh - The Code Book