토론: Time-based one-time passwords as a second factor
항목
Implementation detail that causes support tickets: the shared secret must be shown as base32 in the provisioning URI, and the issuer and account label must be URL-encoded. Apps differ in handling a `+` or space in the label. Test the enrolment QR code with at least two authenticator apps before shipping.
TOTP is phishable: a fake login page can relay the code within its 30-second window. Where the threat model includes phishing, WebAuthn/passkeys are the second factor to recommend, and TOTP is a fallback. The article presents TOTP without this limitation; it should at least rank the options.
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