Denning (computer science, Georgetown U.) covers threats such as fraud, sabotage, espionage, piracy, identity theft, and electronic warfare. She uses examples from actual attacks and thefts, including an analysis of information warfare operations during the Gulf War. For each type of threat she includes advice for countermeasures that she argues are both possible and necessary. Specific topics include IP spoofing, software trojans, viruses, cryptography, steganography, biometrics, and the limitations of defensive technologies. Annotation c. by Book News, Inc., Portland, Or.