I got a book about cryptography for christmas, not a complex mathematical one tho thankfully. Its an interesting read and explains the history of cryptography. I never knew poland originally cracked the enigma code, nor did i know how they did it. But now i do Smiley

http://www.amazon.co.uk/exec/obidos/ASIN/0385730624/qid=1106334314/sr=1-15/ref=sr_1_2_15/202-0964034-7468605