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I want to require a user to plug in a flash drive before letting them authenticate with his/her password.

Are there any solutions that work well for laptops, preferably Macs?

I'm not looking for a Smart Card, I want something more portable and off the shelf.

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up vote 2 down vote accepted

Welcome to Superuser!

The company I worked for used a solution by Rohos, here's a link to their website:

They offer flash drive login authentication for both Windows and Mac operating system. It comes with Two-factor authentication with PIN code which makes our system more secure.

I hope my answer helped, please ask if you have additional questions.

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Thanks! I don't know how I missed it! – lswim Aug 6 '12 at 2:24

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