I have an encrypted hard disk with luks encryption. When I try to open it via:

cryptsetup luksOpen /dev/sdc1 backup

It prompts me for a password, but then errors out on me:

device-mapper: reload ioctl on failed: No such file or directory

My device still has header information, though:

LUKS header information for /dev/sdc1

Version:        1
Cipher name:    aes
Cipher mode:    cbc-essiv:sha256
Hash spec:      sha1
Payload offset: 4096
MK bits:        256

I'm just making up the word backup. Do I need to register it somehow? Is my data recoverable?

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