google/OpenSK

Health v2 · maintenance only

Adoption not part of the score

3404 stars · 334 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

OpenSK is an open-source Rust implementation of a FIDO2/FIDO U2F security key, developed by Google as a research platform. It can run as firmware on Nordic nRF52840 hardware, as a Wasefire applet, or as a library.

Use cases

• build my own open-source FIDO2 security key
• implement CTAP2/WebAuthn authenticator firmware in Rust
• research hardware two-factor authentication tokens
• flash a FIDO U2F key onto a Nordic nRF52840 dongle
• experiment with hardware-backed passkey authentication
• study certified security key implementations

When to choose

• you want a fully open-source security key stack from OS to application
• you need a Rust codebase for FIDO2/CTAP research or prototyping
• you have supported hardware like the nRF52840-DK or dongle

When to avoid

• you need a production-ready, FIDO-certified key for daily use (the develop branch is explicitly proof-of-concept)
• you want a turnkey consumer security key without hardware work
• you need certified CTAP 2.1+ features, since the develop branch is not FIDO certified

Facets

library · maturity active

security cryptography auth embedded security embedded-systems hardware embedded rust fido2 u2f webauthn ctap2 security-key firmware tock-os nrf52840 two-factor-authentication passkeys authentication

Member repositories

For agents

markdown · JSON · MCP: product_card(name="google/OpenSK")