Meino Christian Cramer wrote:
Hi
I am using growisofs/mkisofs to create my data DVDs.
Now I want to encrypt them. With my CDs I used loop-AES for this
purpose, but I haven't found a way to do so with growisofs due to
the different workflow.
Thank you very much in advance for any hint or trick or help to
achieve this.
The problem revolves around your choice of writing once or being able to
grow. If you wish to grow I would have to wait and see if someone has a
really good way to do it, while for writing a one-shot DVD, it's simple.
Create a file the size of the filesystem you want to write. I suggest
that filling it with /dev/urandom will be a bit slower than /dev/zero,
but may (or may not) make it harder to break. If you're just trying to
have a minimum level of security it probably doesn't matter. Then mount
it with loop-AES, cryptoloop, whatever you like. Now write your data to
the image, using mkisofs or creating an ext2 filesystem and mounting
that. For excrypted backups that's often easier, since you can just copy
data.
Then unmount and just burn the file you created. It can be mounted (at
least with cryptoloop, haven't tried loop-AES in over a year), and read
just fine.
Extrapolation: using ufs and DVD-RW you can have a live encrypted
filesystem. I have not tried this, but several people have written that
it works.
I do backups that way, I take a du of what I want, break it into 4400MB
chunks with breaker, and then let a script create each filesystem and
burn the DVD. For 12GB of data it's practical, but I am waiting for
Blue-Ray 50GB media to to anything of serious size.
--
bill davidsen <[EMAIL PROTECTED]>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
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