Passkeys, FIDO2 and WebAuhtn .NET library.
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Updated
Dec 11, 2025 - C#
Passkeys are a form of passwordless user authentication for websites and apps, that is designed to provide a high level
of security by leveraging public key infrastructure. Unlike passwords, no shared secret is exchanged between the user
and a service. Instead, the public key is sent to the server, while the private key is stored in the user’s device.
To verify the user’s identity, users can use biometric data, such as a fingerprints or facial recognition, instead of
relying on a user-generated password. This makes it much more difficult for attackers to gain unauthorized access to an
account, as passkeys are two-factor-authentication (2FA) by default. Concisely, they avoid a range of
password-based attacks, including phishing, by providing an additional layer of security.
Passkeys, FIDO2 and WebAuhtn .NET library.
WebAuthn (Passkeys) library for .NET.
Passkeys/FIDO2/WebAuthn .NET Library for Windows Desktop and CLI Applications
Shark WebAuthn library for .NET. WebAuthn allows users to authenticate with cryptographic key pairs, where the private key remains securely stored on the user's device. This makes authentication resistant to phishing, credential stuffing, and data breaches.
Microsoft Entra ID external authentication methods
Example integrating Authsignal with Duende Identity Server
A comprehensive .NET SDK for implementing secure passwordless authentication in your .NET applications using MojoAuth's authentication services. This SDK provides a seamless way to integrate modern authentication methods while maintaining the robust type safety and performance characteristics that .NET developers expect.