security en
Security key
security
Also called: hardware security key
Plain-language definition
Plain-language definition
A physical authenticator used to prove possession during sign-in.
Why it matters
Origin-bound security keys resist credential phishing better than reusable codes or passwords.
Technical detail
A security key is a hardware cryptographic authenticator that performs challenge-response operations and may require local user presence or verification.
Examples
- A technician touches a USB security key to approve an administrative sign-in.
Related terms
Sources and review
Reviewed July 12, 2026 by [email protected]. Next review due January 11, 2027.
- Passkeys — FIDO Alliance Accessed 7/11/2026
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