Secure and safe login and commits with GitLab + Yubico

This post details the integration of YubiKeys for multi-factor authentication (MFA) with GitLab, leveraging FIDO Universal 2nd Factor (U2F) and FIDO2/WebAuthn protocols. It provides step-by-step instructions for setting up YubiKeys for login and for configuring GPG keys on YubiKeys to enable verified commits. The technical details include the cryptographic challenge-response mechanism for authentication and the process of generating and exporting GPG keys for GitLab integration.