Cryptography
Books
Handbook of Applied Cryptography
A comprehensive source from which to learn cryptography, serving both students and instructors
Ebooks
An Overview of Cryptography
An Overview of Cryptography
Websites
A Cryptographic Compendium
An in-depth looking into Cryptography
Practical Cryptography
A website with information regarding Ciphers, Hashes, and Crypt analysis.
Simon Singh- Cryptography
Simon Singh's cryptography website