Using a removable-device-recorded passphrase to decrypt a system

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Hi

I decided to use a 512-byte randomly generated passphrase to crypt my
system partition. I recorded this passphrase on a removable device (USB
key) and correctly wrote the crypttab and fstab files and updated my
initrd.img for all this to work.

I am anxious now to replicate my passphrase on additionnal USB keys, in
case my primary USB key get lost or damaged.

For some reasons, I cannot name all partitions where my passphrase will
be recorded with a unique label.

I tried to write several lines in the crypttab file for defining as many
passphrase locations as necessary such as
root UUID=uuid /dev/disk/by-label/USBkey1/passphrase:x
luks,keyscript=/lib/cryptsetup/scripts/passdev
root UUID=uuid /dev/disk/by-label/USBkey2/passphrase:x
luks,keyscript=/lib/cryptsetup/scripts/passdev
and so on, but this does not work.

I thank in advance anybody who can advise me on how to solve this issue.

Arbiel

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