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> Why hasn't such a product been invented yet?

The YubiKey Nano is really small. I'm sure a skilled piercer could find a way to get it under your skin.

The YubiKey's that support NFC are all significantly larger. The Nano does not currently support NFC. Size is a challenge with NFC specifically as I believe larger NFC chips lead to larger area of allowable communication.

You have your elbow close to your laptop anyways... might as well plug in.

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