Being an expert in Computer Security is being an expert in Computer Science. Too many "best practices" are misconceptions because the deep Computer Science foundation is absent.
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What's an example best practice caused by deep comp-sci foundation being absent? I am trying to understand better what counts as foundation in this statement (it is an overloaded word).
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AV is one example. Organizations mandate it even though it detects only known threats, is easily bypassable, increases the attack surface, and most AV products contain exploitable vulnerabilities.