wipe utility

[christoph at linuxsoup.com (christoph at linuxsoup.com)]

I am just catching up on some email, but this thread caught my interest.
I have looked into the ext3 code or read any of the papers, but I was
always under the impression that the filesystem journal only stored a
bitmask (table) of modified blocks.  There shouldn't be any data in there.

Any pointers to reading materials?

-christoph


Jerry Feldman wrote:
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> On Fri, 13 Aug 2004 12:56:48 -0400
> Cole Tuininga <colet at code-energy.com> wrote:
> 
> > If you want to be more secure, you could always have /tmp be a tmpfs
> > (aka a ram disk).  Then the data is never stored on a hard drive
> > anyway.  
> > 
> > Well, excluding swap I suppose.  Nevermind.
> I would think that this is probably a good reason that a file system
> level wipe is not overly affective. There is data left in the swap file,
> in the journals, ...
> I think something like shred(1) works only to make it more difficult for
> another online user to see data left in a file. Since John Malloy was
> the original poster, maybe John can be more specific as to why he wants
> to use it, and how clean. 
> 
> -- 
> Jerry Feldman <gaf at blu.org>
> Boston Linux and Unix user group
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