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by cflee
2826 days ago
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WebAuthn is backward compatible with U2F tokens, but naturally only for use as second factor. They defined CTAP1 as the U2F protocol for existing tokens, then defined the new CTAP2 for communication with the new tokens, and made both part of the spec. From a Yubico blog post (https://www.yubico.com/2018/05/what-is-fido2/): > WebAuthn and CTAP2 are both required to deliver the FIDO2 passwordless login experience, but WebAuthn still supports FIDO U2F authenticators, since CTAP1 is also part of the WebAuthn specification. |
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