LUKS and Yubikey
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In your Linux Security Techniques it´s one episode about LUKS
In that episode you say that you are not sure if a Yubikey works with LUKS
I found following solution for Ubuntu: https://www.howtoforge.com/ubuntu-two-factor-authentication-with-yubikey-for-harddisk-encryption-with-luks
Here a solution for Arch Linux: https://github.com/agherzan/yubikey-full-disk-encryption
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Interesting. That article is for Ubuntu 14.04 so it looks like the solution has been around for quite a while. I'll have to check it out. Thank you for posting that.