Register as a 3rd-party passkey store on Windows

[alensiljak]

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Brief Summary

As someone recently hinted in one of the passkeys-related issues (sorry, I lost track and can't find it now), Microsoft seems to be working on allowing 3rd-party passkey stores on Windows. It is early days but we could keep track of it here, with news and updates, similar to what was done for passkeys support feature, in general.

So far, I see that the feature is being tested in the Insider Builds (and should check this on a workstation with the preview builds).

• https://blogs.windows.com/windowsdeveloper/2024/10/08/passkeys-on-windows-authenticate-seamlessly-with-passkey-providers/
• https://www.techradar.com/pro/microsoft-could-soon-add-third-party-passkeys-to-windows-11

The interesting bit is "A plug-in model for third-party passkey providers".

Microsoft is partnering closely with 1Password, Bitwarden and others on integrating this capability to provide users with seamless third-party passkey provider integration into Windows 11.

The build with the initial support should be Preview Build 22635.4515 (KB5046756).
The articles here are a few months old and there could be some progress in addition.

The functionality seems to be offered through WebAuthn API.

Example

Using KeePassXC database as the ultimate passkey provider/store across devices. In this case, on Windows.

Context

Sharing passkeys across devices. Storing passkeys offline as a backup mechanism.

[alensiljak]

Webauthn API links:

• https://learn.microsoft.com/en-us/windows/security/identity-protection/hello-for-business/webauthn-apis
• https://github.com/Microsoft/webauthn
• https://learn.microsoft.com/en-us/windows/win32/webauthn/-webauthn-portal
• https://learn.microsoft.com/en-us/windows/win32/api/_webauthn/