NIST’s 2025 update to SP 800-63B replaces fiddly complexity rules with what actually works: long passphrases, breached-password screening, and phishing-resistant MFA. This guide explains the changes in plain English and shows how to build a password policy that improves real-world security while reducing user friction.
Chasing “five nines” sounds heroic, but every extra nine slashes downtime while exploding cost and complexity. This post translates nines into real minutes, shows why the next nine often isn’t worth it, and walks through setting solid SLOs with error budgets. We share a quick ROI model, vendor-SLA gotchas, and practical ways to raise reliability—graceful degradation, safer deploys, and drills—so you buy the reliability your users feel, not vanity nines.
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