How Can a CISO Prove Security Controls Are Working?
A CISO proves security controls are working by showing, for each control that matters, a current test result read from the system that enforces it, the date of that evidence, what happened to every failure since the last report and how the related risk moved. This guide covers what counts as proof, what the board, the CFO, regulators and auditors each need, how to measure control effectiveness with NIST SP 800-55, and how to communicate residual risk and show it falling.
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