Two-factor / multi-factor authentication — the most common use. Works with Google, GitHub, AWS, password managers (1Password, Bitwarden), and thousands of other services via FIDO2/WebAuthn or TOTP. SSH authentication — store your SSH private key on the device so it never touches disk. Great for server access. GPG/PGP operations — sign commits, encrypt/decrypt files. The private key lives on the key and can’t be exported. PIV smart card — certificate-based auth for enterprise systems, VPNs, etc. Static passwords — store a long static password that types itself on button press. OATH TOTP/HOTP — store 2FA seeds for services like an authenticator app, but hardware-backed.
Projects
A way to decrypt sensitive things after I die. Just put it in a safe with directions.