Understanding PKI

Carlisle Adams, Steve Lloyd

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Since SSL is the backbone of the secure internet, (now technically called TLS), what are some good books I should read up on to understand all aspects of it?

I suppose I'll need to learn some math, some PKI books, crypto, and Sysadmin books as well. Since that isn't a complete list I'm interested in hearing what you think is wise to learn as well.

As far as cryptography goes, this is the best there is:

Applied Cryptography: Protocols, Algorithms, and Source Code in C

You will learn all there is from the basic building blocks upwards.