OpenSK

OpenSK is an open-source implementation of FIDO2 (WebAuthn + CTAP) security keys, written in Rust and designed to run on affordable microcontroller boards. It provides the full authenticator stack—USB/NFC transport, CTAP protocol handling, credential management, and cryptographic operations—so you can build and audit your own hardware token. The project emphasizes defense-in-depth: memory-safe Rust, hardened crypto, isolation via an embedded OS, and explicit user presence/verification flows. Developers can flash reference hardware, customize UX (LEDs, buttons, PIN), and experiment with extensions while staying interoperable with major browsers and platforms. A test and conformance suite validates protocol behavior against the WebAuthn/CTAP specs to ensure compatibility.

Features

Full FIDO2/WebAuthn authenticator stack in Rust
USB and NFC transports for desktop and mobile use
Credential storage, PIN management, and resident keys
Hardware reference designs and flashing instructions
Conformance tests to validate CTAP/WebAuthn behavior
Extension points for custom UX or experimental features

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License

Apache License V2.0

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Additional Project Details

Programming Language

Rust

Related Categories

Rust Security Software

Registered

2025-10-09

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