1992-12-20 - Re: Destroying Data (Re: Remailer Policies)

Header Data

From: peter honeyman <honey@citi.umich.edu>
To: yanek@novavax.nova.edu (Yanek Martinson)
Message Hash: d5244fbb4d3632ddfeda8c90a603834a39e14f6fe18f986eb662672dbf23e5b5
Message ID: <9212201556.AA22792@toad.com>
Reply To: <9212201344.AA26203@novavax.nova.edu>
UTC Datetime: 1992-12-20 15:56:42 UTC
Raw Date: Sun, 20 Dec 92 07:56:42 PST

Raw message

From: peter honeyman <honey@citi.umich.edu>
Date: Sun, 20 Dec 92 07:56:42 PST
To: yanek@novavax.nova.edu (Yanek Martinson)
Subject: Re: Destroying Data (Re: Remailer Policies)
In-Reply-To: <9212201344.AA26203@novavax.nova.edu>
Message-ID: <9212201556.AA22792@toad.com>
MIME-Version: 1.0
Content-Type: text/plain


> Make sure you don't think 'rm -rf /remailer-logs' actually destroys data.
> It merely de-allocates the i-nodes.  You need to know which physical
> device the filesystem is on, (let's call id /hdxxx) and then do
> 'cat /dev/null > /dev/hdxxx' which overwrites with zeroes all data
> on that partition.  

not quite.  you need something like

  dd if=/dev/null of=/dev/xxx bs=verybig conv=sync

this will zero out every block on the disk.  but this is overkill --
why not just apply this technique to the individual logs, zeroing
out their data blocks?

	peter

ps:  is it certain that zeroing out the data blocks thoroughly destroys
the data?  i've heard that a "shadow" of some sort may remain.

Thread

• Return to December 1992

• Return to “dclunie@pax.tpa.com.AU (David Clunie)”
• Return to “Eric Hollander <hh@soda.berkeley.edu>”
• Return to “peter honeyman <honey@citi.umich.edu>”
• Return to “Peter Shipley <shipley@tfs.COM>”
• Return to “Phiber Optik <phiber@eff.org>”

• Return to “yanek@novavax.nova.edu (Yanek Martinson)”

• 1992-12-19 (Sat, 19 Dec 92 14:50:47 PST) - Re: Remailer Policies - dclunie@pax.tpa.com.AU (David Clunie)
  • 1992-12-20 (Sun, 20 Dec 92 00:02:57 PST) - Re: Remailer Policies - Eric Hollander <hh@soda.berkeley.edu>
    • 1992-12-20 (Sun, 20 Dec 92 05:45:43 PST) - Destroying Data (Re: Remailer Policies) - yanek@novavax.nova.edu (Yanek Martinson)
      • 1992-12-20 (Sun, 20 Dec 92 07:56:42 PST) - Re: Destroying Data (Re: Remailer Policies) - peter honeyman <honey@citi.umich.edu>
        • 1992-12-22 (Mon, 21 Dec 92 16:43:07 PST) - Re: Destroying Data (Re: Remailer Policies) - Phiber Optik <phiber@eff.org>
          • 1992-12-22 (Mon, 21 Dec 92 17:07:02 PST) - Re: Destroying Data (Re: Remailer Policies) - Peter Shipley <shipley@tfs.COM>
          • 1992-12-22 (Tue, 22 Dec 92 05:44:41 PST) - Re: Destroying Data (Re: Remailer Policies) - peter honeyman <honey@citi.umich.edu>
            • 1992-12-22 (Tue, 22 Dec 92 07:11:12 PST) - Encrypting Remailer Logs - yanek@novavax.nova.edu (Yanek Martinson)