[CentOS] system encryption question

Thu Mar 2 02:27:33 UTC 2017
Joseph L. Casale <jcasale at activenetwerx.com>

> How can a key,  residing on a usb flash drive,
> to be added to the  encryption of / ?
> So the system needs both manual input of pass phrase
> as well as presence of  usb flash drive to
> come up after getting  rebooted.

You can do this with dm-crypt and an encrypted key file stored on a USB.