RS-Key: Security key. FIDO/OpenPGP firmware for RP2350
Summary
RS-Key is an open-source security-key firmware for the Raspberry Pi RP2350 that implements FIDO2, OpenPGP, PIV, OATH, and OTP features. The project emphasizes development and research use, warns it is not a secure element and lacks external audits, and discusses threat model, limitations, and production hardening via OTP fuses and secure boot. It also provides host tooling and build steps.