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Why does losing my phone mean choosing between lockout and SMS fallback?

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기회

Passkeys eliminate passwords but introduce a fragility the FIDO2 spec does not solve: account recovery. If you lose your only enrolled device and have not pre-configured vendor-specific sync, you are locked out or forced back to SMS OTP, which re-opens the SIM-swap attacks passkeys were supposed to close. Apple, Google, and Microsoft each built incompatible sync silos, so moving from iOS to Android means re-enrolling at every service by hand. The WebAuthn spec defines how to create and use credentials but explicitly defers recovery to each platform. No vendor-neutral, cryptographically sound recovery primitive exists that preserves the original threat model.

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Recovery is the weakest link in the passwordless stack, and solving it is the last mile that makes passkeys a viable replacement for passwords at scale.

기회 평가 방식

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심각도8/10

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