Security key

A security key is a small physical device, usually plugged into USB or tapped by NFC, that proves it is really you when you sign in.

What it means for you

It is a strong second step and can hold passkeys, but it is optional for most households. Buy two so a lost key does not lock you out, and see our 2FA guide for official Yubico and Google options.

Guides on this topic

• 2FA, Passkeys and Security Keys for Your Home

  Turn on two-factor sign-in with a free authenticator app, add passkeys where offered, and decide whether a security key is worth it.

• How to Secure Your Security Camera

  Seven steps from two-factor sign-in and updates to IoT networks and safe sharing.

• Password Managers for a Household: Free Options First

  Start with the free built-in managers from Apple and Google, then compare free Bitwarden and Proton Pass plans, plus breach alerts and a weekend plan.

Related terms

• Two-factor authentication
• Passkey
• Authenticator app
• Phishing

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Definitions are short and general. For model-specific details, check your device maker’s own documentation.