SHRED for EXT3?
Mike McCarty
mike.mccarty at sbcglobal.net
Thu Jul 28 00:28:30 UTC 2005
Damian Menscher wrote:
> On Wed, 27 Jul 2005, Mike McCarty wrote:
>
>> Damian Menscher wrote:
>>
[snip]
>>> My first thought when seeing this thread a few days ago was:
>>> remount as ext2; shred files; remount as ext3
>>> I'm fairly certain that meets DoD standards.
>>
>>
>> DOD standard is probably beyond what I need. Umm, how
>> does one unmount/remount one's root?
>
>
> Simplest method: modify your /etc/fstab to say ext2 instead of ext3,
> then reboot. It will then mount it without using the journal. (The
> method the other poster gave, of using tune2fs to remove the journal,
> may or may not work on an ext3 filesystem mounted read/write.) After
> you've wiped the data, change /etc/fstab back to ext3 and reboot.
Thanks, that's useful info.
>> Presumably, you have never heard of the Watergate Tapes and the
>> "erased" tapes which were later recovered.
>
>
> Accidental erasure with a single pass with non-random data to cover a
> signal that is highly redundant is hardly a comparison. DoD standards
Whether it was accidental seems to be a debatable point :-)
Whether it was single pass *also* seems to be a debatable point :-)
I happen to remember some of the debate.
C Language source files are significantly non-random data.
Are you an expert in data recovery or data obliteration?
[snip]
> How much is their data worth? Probably not that much, or they wouldn't
> have let you take it home. So delete it to the point that it would no
> longer pay to recover it. If it is no longer worth recovering, it has
> been effectively deleted.
At a guess, it has over 2000 man years into it. It is in a very
competitive industry (health care related).
Mike
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