passwordless-lib/fido2-net-lib

Health v2 · maintenance only

Adoption not part of the score

1448 stars · 201 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A battle-tested .NET library implementing a FIDO2 server / WebAuthn relying party for passkey registration (attestation) and authentication (assertion) validation. It enables passwordless sign-in and strong MFA in ASP.NET, .NET Core, and native .NET applications.

Use cases

• add passkey login to an asp.net core app
• implement webauthn passwordless authentication in .net
• verify fido2 attestation and assertion responses
• support yubikey and windows hello sign-in
• replace password-based login with phishing-resistant mfa
• build a fido2 server / webauthn relying party

When to choose

• you need advanced FIDO2 features like attestation verification beyond .NET 10's built-in ASP.NET Identity passkey support
• you want a conformance-tested, battle-tested open-source WebAuthn implementation for .NET
• you need support for roaming authenticators, platform authenticators, and FIDO U2F backwards compatibility

When to avoid

• your project is not on the .NET platform
• you only need simple passkey support inside ASP.NET Identity and don't need attestation or advanced features
• you want a hosted passwordless API service rather than a self-implemented relying party library

Facets

library · maturity active

auth security cryptography sdk security web-development backend developer-tools dotnet cross-platform fido2 webauthn passkeys passwordless mfa asp-net-core ctap authentication web-server

Member repositories

For agents

markdown · JSON · MCP: product_card(name="passwordless-lib/fido2-net-lib")