Cryptography, the science of secret writing, is the biggest, baddest security tool in the application
programmer's arsenal. Cryptography provides three services that are crucial in secure programming.
These include a cryptographic cipher that protects the secrecy of your data; cryptographic certificates,
which prove identity (authentication); and digital signatures, which ensure your data has not been
damaged or tampered with.
This book covers cryptographic programming in Java. Java 1.1 and Java 1.2 provide extensive support
for cryptography with an elegant architecture, the Java Cryptography Architecture (JCA). Another set
of classes, the Java Cryptography Extension (JCE), provides additional cryptographic functionality.
This book covers the JCA and the JCE from top to bottom, describing the use of the cryptographic
classes as well as their innards.
The book is designed for moderately experienced Java programmers who want to learn how to build
cryptography into their applications. No prior knowledge of cryptography is assumed. The book is
peppered with useful examples, ranging from simple demonstrations in the first chapter to full-blown
applications in later chapters.