Password Hygiene and Credential Rot: When and Why You Must Rotate Account Passwords

The Death of the 90-Day Forced Password Expiration

For decades, corporate IT policies forced employees to create new passwords every 30 to 90 days. However, research conducted by cybersecurity institutions like NIST (National Institute of Standards and Technology) revealed an unintended consequence:

When forced to invent new passwords frequently, humans predictably choose weaker passwords with trivial sequential modifications (e.g., Winter2025! becomes Spring2025!).

The Modern NIST 800-63B Recommendations

Modern cybersecurity hygiene prioritizes:

1. Length over complexity: Passwords should be 16+ characters long.
2. Eliminating arbitrary resets: Change credentials only upon evidence of compromise or account handover.
3. Phishing-resistant Multi-Factor Authentication (MFA): Hardware security keys (YubiKeys) or WebAuthn Passkeys.
4. Auditing password age: Reviewing accounts older than 180 or 365 days to ensure stale credentials aren't left unattended.

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