Unfortunately, cryptography can’t solve most computer-security problems. And the defender has an inherent mathematical advantage: Longer keys increase the amount of work the defender has to do linearly, while geometrically increasing the amount of work the attacker has to do. As long as you don’t write your own algorithm, secure encryption is easy. And in many cases the attacker has an inherent advantage: He only has to find one network flaw, while the defender has to find and fix every flaw.Ĭryptography is an exception. Software, computer and network security are all ongoing battles between attacker and defender. How to Secure Your Computer, Disks, and Portable DrivesĬomputer security is hard.
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