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Two factor authentication with Yubikey for harddisk encryption with LUKS
The yubikey is a cool device that is around for a while and several of us know it and love it. It is a device that is recognizes as a USB HID device and can emit one time passwords on a button press.
Quite for a while the yubikey supports a challenge response mode, where the computer can send a challenge to the yubikey and the yubikey will answer with a response, that is calculated using HMAC-SHA1.
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