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by Bruce Schneier
All security decisions involve trade-offs: how much security you get, and what you give up to get it. When we decide whether to walk down a dimly lit street, purchase a home burglar alarm system, or implement an airline passenger profiling system, we're making a security trade-off. Everyone makes these trade-offs all the time. It's intuitive and natural, and fundamental to being alive. But paradoxically, people are astonishingly bad at making rational decisions about these trade-offs.