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Under NIST SP 800-63B-4, what is the minimum length for a password used as the only authentication factor?

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  1. 8 characters
  2. 12 characters
  3. 15 characters

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References

  1. NIST SP 800-63B-4, Digital Identity Guidelines: Authentication and Authenticator Management nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-63b-4.pdf Checked 2026-10-10.
  2. NIST SP 800-63B-4, Digital Identity Guidelines: Authentication and Authenticator Management nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-63b-4.pdf Checked 2026-10-10.

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