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Ask HN: Why do you have to touch a USB security key?

2 points by whyage ↗ HN
Why do you have to touch a YubiKey and similar security keys? I get the "something you have" principle, but by the same token (pun intended) I can have something without touching it with my bare finger.

2 comments

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stop50
Its an check for the firmware to see if the user really requested it.
phillipseamore
It is so that a key attached to a compromised system can't be used remotely.