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2b8b6b6
Hardware MFA tokens, basically. Great to protect accounts, servers, SSH keys.
https://paulstamatiou.com/getting-started-with-security-keys
Paul StamatiouGetting started with security keysHow to stay safe online and prevent phishing with FIDO2, WebAuthn and security keys. A look into YubiKeys, TOTP authenticator apps, passwordless and more.