[wellylug] Encrypted backup recovery

[Mark Signal]

Is bzip2 generally regarded as more robust than gzip?



cheers

Mark

-----Original Message-----
From: wellylug-admin at lists.naos.co.nz
[mailto:wellylug-admin at lists.naos.co.nz]On Behalf Of David Antliff
Sent: Tuesday, 24 August 2004 5:22 p.m.
To: wellylug at lists.naos.co.nz
Subject: Re: [wellylug] Encrypted backup recovery




On Mon, 23 Aug 2004, Kevin Dorne wrote:

> Does anyone know of an encryption scheme that can (to some degree)
> recover from read errors on the disk?

I'm guessing what you really want to do is encrypt them and *then* apply
some sort of redundant encoding to the encrypted file(s). It might be
easier to think of it in this way - forget trying to find something tied
up with encryption and just look for a way of injecting redundant
information. I don't really know of any specifically for that task but you
suggest that bzip2 can cope with some errors? Why not bzip2 the encrypted
file then?

Do any of those ASCII encodings (MIME) pad out with redundant information?
Maybe there's something that can add parity? The encryption just clouds
the issue, if I understand what you're trying to do properly.

Also, if DVD formats are anything like CDROM, you get redundancy just by
writing to disk anyway - the interleaving and encoding on a CDROM is
pretty robust.

Or you could just put the encrypted file on the disk twice? Or better yet,
on two different disks? There should be enough redundancy there to recover
your information even if one disk is completely destroyed! ;)


-- 
David.


-- 
Wellington Linux Users Group Mailing List: wellylug at lists.naos.co.nz
To Leave:  http://lists.naos.co.nz/mailman/listinfo/wellylug

---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.742 / Virus Database: 495 - Release Date: 19/08/2004

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.742 / Virus Database: 495 - Release Date: 19/08/2004