This book is quite incomplete because it only offers the reader an introduction to many of the topics. Other topics are simply left out because of time and space constraints. This section is intended to offer some suggestions for further reading and exploration.

A good place to begin is with history. David Kahn's Codebreakers is an excellent survey of the history of cryptology [Kah67]. There are numerous descriptions of steganographic solutions like secret inks and microdots. More recent histories are published in Cryptologia.

There are also a number of other good books on the subject. Stefan Katzenbeisser and Fabien Petitcolas edited a collection of essays from the leading researchers entitled Information Hiding Techniques for Steganography and Digital Watermarking [SKE00]. Neil F. Johnson, Zoran Duric, and Sushil Jajodia's recent addition, Information Hiding: Steganography and Watermarking, is the first part of a series [JDJ01]. Ross Anderson's general survey, Security Engineering, also includes some information on steganography and watermarking [And01].

Some of the best material can be found, in its original form, in the Proceedings of the Information Hiding Workshop. There have been four conferences, and more are scheduled.

Other more specific information can be found in these areas.

• Error-Correcting Codes. Chapter 3 in this book cannot do justice to the wide field. There are many different types of codes with different applications. Some of the better introductions are [LJ83] and [Ara88]. There are many others.

• Compression Algorithms. Compression continues to be a hot topic, and...