Physical Security CHAPTER 7 The first seven of these categories--extreme temperature, gases, liquids, living organisms, projectiles, movement, and energy anomalies--were defined by Donn Parker in his book Fighting Computer Crime. 99 ADDITIONAL RESOURCES The book fighting Computer Crime, also the source of the Parkerian hexad that we discussed in Chapter 1, is a must-read for the serious information security practitioner. Although it was written more than a decade ago, it is still very relevant to the field and is an excellent book as well. It is available from Wiley (ISBN: 0471163783). As we move through the sections in this chapter on protecting people, equip- ment, and data, we will discuss how the different threats apply to each of them. In some cases, we might find that all the threats apply in a given cat- egory, or we may find that some of them are nullified entirely. PHySICAL SECURITy CONTROLS