All software security depends on hardware security. If the hardware can be stolen or surreptitiously replaced, secure software will not help. When computers filled a room, stolen computers were not a big problem. Now that laptop and palmtop computers are the fastest growing market, physical security is at least as important as software security.
Some of the most common problems are:
Some of the safeguards which can be taken are:
Most of these safeguards are required for the DoD's System High and Compartmented Mode Workstations, which are briefly discussed in a later section.
Other problems related to hardware are eavesdropping via electro-magnetic interference (EMI) detection and analysis, and communications interception. EMI detection is out-of-scope for this report. Communications interception is discussed in Chapter 9.