Encrypted filesystem image

jack jdangler at terremark.com
Fri Jul 13 15:41:28 UTC 2007


On Fri, 2007-07-13 at 11:18 -0400, Bart Silverstrim wrote:
> Hello,
> 
> I have an external USB hard disk on which I'd like to create an
> encrypted file that can be mounted so that if I want to back
> everything
> up, I can just copy the file to another system or drive.
> 
> 1) Is there an easy tutorial/howto to do this?  I've googled for it
> and
> it looks like theres a few ways to do it now, but I don't know what is
> considered out of date or what other people have experienced with
> different methods to make this painless.  I'd like to do it in a way
> that either the whole drive partition is formatted as an encrypted
> system or there is a file that is mounted in loopback to appear as a
> separate filesystem and acts as a sparse file, growing on the drive as
> data is added until the "maximum file size" I specify is reached.
> 
> 2) I've looked at truecrypt, but either I'm doing something wrong or
> Ubuntu isn't entirely truecrypt friendly with how it mounts the
> truecrypt files and/or permissions with root and the admin user when
> mounting the image so I have problems with copying files to the image
> file because it gets mounted as root and I'm trying to use it as a
> user.
> 
I don't remember the link off the top of my head, but if you google for
"how to truecrypt setup" you'll find a couple of very good links for
ubuntu and setting this up for both normal and hidden volumes.  Also,
there is a caveat in one that says to chmod +s for the truecrypt exec to
be able to user truecrypt as the user, but it didn't work for me.
However, when I went back and did a chmod -s to the file, I was able to
access it and the volume...

hth

Jack

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