Guidelines for secure email fallback in login OTP systems outlined

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An article provides guidelines for implementing secure email fallback when SMS is unavailable for one-time passwords during login or password reset. It recommends the application generate a short-lived credential, store a hash, and limit verification attempts. Key design invariants are outlined, including ensuring a challenge has a single purpose and a single successful use. The article stresses that delivery confirmation does not equate to authorization and that audit trails must be maintained without logging raw secrets.

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