Open LUKS encrypted device via key on USB stick
Background If you want to encrypt the root file system of a computer running Linux with LUKS, you usually have to entere the encryption password at every system boot. Especially in the case of a headless computer acting as a server this is not suitable. To overcome this problem LUKS offers the possibility to store the encryption key as a keyfile and use it to open the encrypted disk. There also exist several guides how the keyfile can be stored on a USB stick. Examples include here, here or here (the second and third guides are only available in German). ...