Best intro to Crypto book

[irongeek at irongeek.com (Adrian Crenshaw)]

Hi all,
    I'd like to get some recommendations for a good intro to crypto book.
Something that would give me a spring board to understanding the ins and
outs of the darknets I've been researching, public key crypto, and the basic
math behind things. I'm getting a little tired of only being able to explain
things with a wave of the hand and saying "the magic part happens here" and
would like to have a deeper understanding.

Thanks

Adrian

ps. A quick and dirty version of the darknets talk from Phreaknic is here:
http://www.irongeek.com/i.php?page=videos/darknets-i2p-tor-phreaknic
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