Update, February 4th 2026: TypingDNA SMS+ just released publicly. Check it out! NIST’s updated Digital Identity Guidelines (SP 800-63B-4) formally classify SMS/PSTN one-time passcodes as a restricted authenticator.
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Contact usUpdate, February 4th 2026: TypingDNA SMS+ just released publicly. Check it out! NIST’s updated Digital Identity Guidelines (SP 800-63B-4) formally classify SMS/PSTN one-time passcodes as a restricted authenticator.