Individual skill

implementing-hardware-security-key-authentication

Builds a FIDO2/WebAuthn relying party server with the python-fido2 library, covering registration and authentication ceremonies, YubiKey enrollment, resident key (discoverable credential/passkey) workflows, and user verification policies. Use when implementing phishing-resistant MFA with hardware security keys, building a WebAuthn relying party, enrolling YubiKeys for a workforce, or migrating password-based authentication to passkeys.

skills/implementing-hardware-security-key-authentication/SKILL.md

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Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 35,862
Repository last updated: Aug 31, 2026
License: Apache-2.0

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ai-agents Repository topic
claude-code Repository topic
cybersecurity Repository topic
incident-response Repository topic
mitre-attack Repository topic
penetration-testing Repository topic
red-team Repository topic
security Repository topic
cloud-security Repository topic
malware-analysis Repository topic
fido2 Declared skill tag
webauthn Declared skill tag
hardware-security-key Declared skill tag
yubikey Declared skill tag
passkeys Declared skill tag
passwordless-authentication Declared skill tag
ctap2 Declared skill tag
security Derived category

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# Implementing Hardware Security Key Authentication

## When to Use

- Deploying phishing-resistant multi-factor authentication (MFA) using FIDO2 hardware security keys for high-value accounts (administrators, developers, privileged users)
- Building a WebAuthn relying party server that supports both roaming authenticators (USB/NFC security keys) and platform authenticators (Windows Hello, Touch ID, Android biometrics)
- Migrating an existing password-based authentication system to support passkeys (discoverable credentials) as a primary or secondary authentication factor
- Enrolling YubiKey devices for an organization's workforce, including PIN setup, credential registration, and backup key provisioning
- Implementing passwordless authentication flows that comply with NIST SP 800-63B AAL3 (authenticator assurance level 3) requirements

**Do not use** without HTTPS in production (WebAuthn requires a secure origin), for systems where users cannot physically access a USB/NFC port, or as the sole authentication factor without a recovery mechanism for lost keys.

## Prerequisites

- Python 3.10+ with `fido2` (python-fido2 >= 2.0.0), `flask`, and `cryptography` libraries installed