[OpenAFS] Tape encryption for backups?

[Joshua Hutchins]

Hello all-
    We've recently started backing up our AFS volumes to tape.  However,
we would like to encrypt our tapes (some of them will be going off-site,
and we want to protect our data).  I haven't found any way to specify
encryption directly to OpenAFS, and there doesn't seem to be any
transparent encryption layer we can use for tapes (we're running
Linux).  We looked into amanda-afs because we can get amanda to do
encryption, but amanda-afs seems rather outdated and unmainted.

Has anyone tried to use encryption and come up with a solution?

Thanks, Joshua