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J2EE™ Security for Servlets, EJBs and Web Services: Applying Theory and Standards to Practice by Pankaj Kumar

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Chapter 3. Cryptography with Java

Cryptography, or the art, science and mathematics of keeping messages secure, is at the heart of modern computer security. Primitive cryptographic operations such as one-way hash functions, also known as message digests, and encryption, either with symmetric or asymmetric algorithms, form the basis for higher level mechanisms such as MAC (Message Authentication Code), digital signature and certificates. At yet another level, these are merely building blocks for security infrastructure consisting of PKI, secure communication protocols such as SSL and SSH, and products incorporating these technologies.

The study of principles and algorithms behind these cryptographic operations and security protocols is fascinating ...

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