Re: International Crypto Patch / Loopback Encryption to Raw Partition

From: Marc Mutz (Marc@Mutz.com)
Date: Mon Jan 17 2000 - 12:46:12 EST

"Scott V. McGuire" wrote:
>
<snip>
> Also, any ideas on conveniently backing up the raw partition?
<snip>

Use CONFIG_BLK_LOOP_USE_REL_BLOCK (or similar) and get a DAT or any
other removable media and cp/dd it.

If you don't use CONFIG_..._BLOCK but still want to backup the file,
then do something along the following:

$ losetup -e your-cipher /dev/loop0 your-crypto-file
Password : your-passphrase
$ losetup /dev/loop1 your-crypto-backup-file
$ losetup -e your-backup-cipher /dev/loop2 /dev/loop1
Password : your-backup-passphrase
$ dd if=/dev/loop0 of=/dev/loop2
$ for i in 2 1 0; do losetup -d /dev/loop$i; done

(with this, you can even take
your-backup-{passphrase,cipher} != your-{passphrase,cipher})

and to restore it:

$ losetup /dev/loop0 your-crypto-backup-file
$ losetup -e your-backup-cipher /dev/loop1 /dev/loop0
Password : your-backup-passphrase
$ losetup -e your-cipher /dev/loop2 your-crypto-file
Password : your-passphrase
$ dd if=/dev/loop1 of=/dev/loop2
$ for i in 2 1 0; do losetup -d /dev/loop$i; done

Marc 

-- 
Marc Mutz <Marc@Mutz.com>        http://marc.mutz.com/Encryption-HOWTO/
University of Bielefeld, Dep. of Mathematics / Dep. of Physics

PGP-keyID's:   0xd46ce9ab (RSA), 0x7ae55b9e (DSS/DH)

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