Steganography is the field of cryptography that studies how to send and detect messages that are hidden within other messages. Although its principles are readily applied to electronic media, it is not generally afforded the attention that other aspects of cryptography receive. Any treatment is, therefore, likely to be of interest. The authors, however, simultaneously do too much and too little. The length of the piece cannot do justice to the topics covered. The topics range over all of steganography, but there is no depth in any of them. Topics are covered only to the extent that readers will know that they exist. More importantly, the promise of teaching experiences is not fulfilled.

The chapter outlines steganographic techniques and principles, such as using the least significant bit in a graphic to hide a message, but it provides no practical examples. It mentions techniques for hiding messages in texts, and in audio and video files, but the authors do not give the reader any sense of them and their detection. In addition, the teaching is divorced from practice as much as the rest of the chapter. It is difficult to get a sense of exactly what the students did, how they did it, and what the impact was on their learning.

The bibliography provides a useful guide to the field, but the teaching practices alluded to are not developed enough to be of much use.