Security key
A physical device used for two-factor login. It checks the website's real address before it responds, so it resists phishing.
Security key in more detail
A security key checks the website's real address before it responds, so it will not log you in to a fake site. That is why CISA calls this type the "gold standard".
Whoever controls your email can reset almost everything else. Give it your best protection: a unique password, a security key or authenticator app, and no text-message fallback.
All 128 terms · Checked against the lesson's sources on 8 October 2026.
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