Hackers sometimes portray their work as a precise process of learning every detail of a system — even better than its designer — then reaching deep into it to exploit secret flaws. But just as often, it’s practically the opposite, a fundamentally random process of poking at a machine and watching what happens. Refine that random poking to a careful craft of trial and error, and it becomes what hackers call “fuzzing”—a powerful tool for both computer exploitation and defense.
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