System Encryption Question

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CentOS 7.x

Let say a clean-install of CentOS 7.x is being performed on a box simply with two partitions / and /boot … and that there is no extra complexity like lvm , raid ,etc,etc …

CentOS 7.x process allows / to be encrypted with pass phrase

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.

Thank you,


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