OpenSK is an open-source implementation for security keys written in Rust that supports both FIDO U2F and FIDO2 standards.

U2F USB token optimized for physical security, affordability, and style

Solo 1 firmware in C

Python library and command line tool for configuring any YubiKey over all USB interfaces.

WebAuthn (FIDO2) server library written in Go

🔏 A small WebAuthn API wrapper that translates to/from pure JSON using base64url.

Zero trust system

Pluggable Authentication Module (PAM) for U2F and FIDO2

A portable Java library for WebAuthn(Passkeys) server side verification

• Updated Mar 20, 2026
• Scala

FIDO2 (WebAuthn) and FIDO U2F platform library for Linux written in Rust

A tool to detect when your YubiKey is waiting for a touch (to send notification or display a visual indicator on the screen)

FIDO-U2F / FIDO2 / Webauthn Framework

Core implementations of an open-source secure key

u2f token firmware for stm32f103 and efm32hg boards

A tiny ARM microprocessor which fits in your USB port.

DEPRECATED Krypton turns your iOS device into a WebAuthn/U2F Authenticator: strong, unphishable 2FA.

Provides Okta authentication for awscli

U2F security token emulator written in Rust

Rust library to interact with Security Keys, used by Firefox