From: Gary Howland <gary@systemics.com>
Date: Sat, 4 May 1996 07:58:07 +0800
To: VaX#n8 <vax@linkdead.paranoia.com>
Subject: Re: encrypted Unix backup software
In-Reply-To: <199605030102.UAA06977@linkdead.paranoia.com>
Message-ID: <318A2206.69D8BD19@systemics.com>
MIME-Version: 1.0
Content-Type: text/plain


VaX#n8 wrote:
>
> Okay, before you flame me and tell me to pipe it through
> a symmetric cipher filter, hear me out.  Tape handling is
> hairy, depending on what kind of functionality you want.  A regular
> filter may write(2) in strangely sized blocks, not working very well
> with your tape drive.

This is what I use:

        tar -c --block-compress --sparse --atime-preserve
--use-compress-program /usr/local/bin/destape  .

and /usr/local/bin/destape looks like this:

        #!/usr/local/bin/bash

        if [ -z "$1" ]
        then
                gzip | /usr/local/bin/des -bE3
        else
                /usr/local/bin/des -bD3 | gzip -d
        fi

I also back up the des/gzip/tar to unencrypted to the start of the tape
too.


Gary
--
pub  1024/C001D00D 1996/01/22  Gary Howland <gary@systemics.com>
Key fingerprint =  0C FB 60 61 4D 3B 24 7D  1C 89 1D BE 1F EE 09 06