Passwords are changing. Where do verification codes fit?
Blog post from Sent
Passkeys are increasingly positioned as the preferred authentication method because they use phishing-resistant public-key cryptography and device unlock mechanisms, but verification codes remain necessary as carefully designed fallbacks for account recovery, unavailable or new devices, public devices, and some step-up actions. SMS and voice codes carry risks such as phishing, carrier delays, phone-number reassignment, and message interception, leading NIST to classify them as restricted authenticators, so higher-risk recovery and sensitive transactions should use stronger methods and additional risk signals. Effective code-based fallback systems should prioritize rapid, reliable delivery across channels, clear status information, appropriate expiration of older codes, alternate recovery paths, and concise messages that identify the business and purpose without requesting sensitive information. As passkey adoption reduces routine code usage, remaining verification messages will become more critical in recovery and exceptional scenarios, making a layered authentication approach preferable to relying on either passkeys or codes alone.
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