Great question — answering as the UphillTech team:
ANSWER FROM 2013 - See other answers for happy times Backup Reformat Restore cryptsetup luksRemoveKey would only remove an encryption key if you had more than one. The encryption would still be there. The Fedora Installation_Guide Section C.5.3 explains how luksRemoveKey works. That it's "impossible" to remove the encryption while keeping the contents is just an educated guess. I base that on two things: Because the LUKS container has a filesystem or LVM or whatever on top of it, just removing the encryption layer would require knowledge of the meaning of the data stored on top of it, which simply is not available. Also, a requirement would be that overwriting a part of the LUKS volume with...
Full answer by MattBianco: https://unix.stackexchange.com/a/60973 (CC BY-SA 3.0).
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