YubiKey hardware security key reference. Covers FIDO2 passkeys, U2F two-factor, TOTP authenticator codes, GPG smartcard for commit signing, ed25519-sk SSH keys, PIV certificates, ykman CLI, OTP slots, PIN management, and model comparison.
Scanned 9/7/2026
Install to Claude Code
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---
name: yubikey
version: 1.0.0
description: >
YubiKey hardware security key reference. Covers FIDO2 passkeys,
U2F two-factor, TOTP authenticator codes, GPG smartcard for
commit signing, ed25519-sk SSH keys, PIV certificates, ykman
CLI, OTP slots, PIN management, and model comparison.
author: BytesAgain
homepage: https://bytesagain.com
source: https://github.com/bytesagain/ai-skills
tags: [yubikey, security, fido2, passkey, gpg, ssh, 2fa]
---
# YubiKey Reference
Hardware security key.
## Commands
| Command | Description |
|---------|-------------|
| `intro` | Models, protocols |
| `setup` | Passkeys, TOTP, U2F |
| `advanced` | GPG, SSH, PIV |
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