Hi.
OpenPGP also uses symmetric encryption (at least for the actual data).
What you can do is: Encrypt the dm-crypt/LUKS key with OpenPGP, which
is what I do personally.
If you're using Debian or a derivate, I can copy you a sophisticated
keyscript for Debian's cryptsetup packge, which does this job.
The one included with Debian, doesn't work and/or as several
functionallity/security problems (not sure about the last status, as I
didn't follow it anymore).
Cheers,
Chris.
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