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Preparation

The easiest way to defend against attack is to eliminate the object at risk. Taking this point to extreme, you could say that the best-defended computer is one locked in a room with no LAN, no modem, no electricity, and no users.

Don't laugh! Some government agencies, research sites, and major defense corporations go nearly this far. They call it an airgap defense. Their offices have a separate, dedicated power supply; closed-circuit air conditioning; no phone lines; no LAN; and so on. (They do still have users, however. One nuclear weapon research facility implemented an airgap defense but then let someone walk out the door with a diskette!)


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