Fido2 vs u2f #468
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Fido2 vs u2f #468
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jscyo
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Nov 26, 2025
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I've added some formatting changes that need to be done for all the points
| author: "Maurice Saldivar" | ||
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| ## FIDO2 vs U2F: 5 Key Differences Explained |
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remove this, title is already mentioned as the h1 tag
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| ## FIDO2 vs U2F: 5 Key Differences Explained | ||
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| U2F laid the groundwork for strong, phishing-resistant authentication. FIDO2 builds on it with broader use cases and modern support. Here's how they differ. |
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this being the first paragraph is confusing, We need to assume that most people reading this article don't know what either of these two standards are
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please resolve this merge conflict correctly
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| U2F laid the groundwork for strong, phishing-resistant authentication. FIDO2 builds on it with broader use cases and modern support. Here's how they differ. | ||
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| Authentication standards evolve to address real security gaps. U2F (Universal 2nd Factor) emerged in 2014 to combat phishing attacks that traditional multi-factor authentication couldn't prevent. FIDO2 arrived in 2018 as the next generation, expanding beyond second-factor authentication to support passwordless login. Both standards use public-key cryptography and bind credentials to specific domains, making them resistant to phishing, credential stuffing, and man-in-the-middle attacks. |
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this section needs to be reworked, to flow better, for example
Authentication standards evolve to close real security gaps. U2F (Universal 2nd Factor), introduced in 2014, offered phishing-resistant MFA using public-key cryptography—something passwords and OTPs couldn't provide. In 2018, FIDO2 expanded this model with WebAuthn and CTAP2, enabling both multi-factor and passwordless authentication.
Both standards protect against phishing, credential stuffing, and man-in-the-middle attacks by binding credentials to specific origins. But their capabilities and long-term viability differ significantly.
also mention that this blog goes over 5 key differences to help devs choose between the two
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| ## 1. Scope of Use | ||
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| U2F operates exclusively as a second factor. Users must first authenticate with a password before U2F verification occurs. The security key proves possession of a registered device but cannot replace the initial authentication step. |
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| U2F operates exclusively as a second factor. Users must first authenticate with a password before U2F verification occurs. The security key proves possession of a registered device but cannot replace the initial authentication step. | |
| **U2F**: operates exclusively as a second factor. Users must first authenticate with a password before U2F verification occurs. The security key proves possession of a registered device but cannot replace the initial authentication step. |
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Make similar changes to the rest of the points so it feels better organized
| U2F operates exclusively as a second factor. Users must first authenticate with a password before U2F verification occurs. The security key proves possession of a registered device but cannot replace the initial authentication step. | ||
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| FIDO2 supports both multi-factor and passwordless authentication. In multi-factor mode, it functions similarly to U2F. In passwordless mode, the security key becomes the sole authentication method. Users verify their identity through biometrics or a PIN on the authenticator itself, eliminating passwords entirely. | ||
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Add a "Why this matters" subheading here
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