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is there a shred-like command in linux for Ext3 filesystems?

Discussion in 'Tech Talk' started by David_G17, Jul 19, 2004.

  1. David_G17

    David_G17 /\/\/\/\/\/\/\/

    2,046
    0
    Oct 7, 2002
    i was looking at the shred man page, and noticed
    i'm using Ext3. is there an alternative to shred that can do the same thing?

    note: i'm not interested in wiping out my entire hard drive ;)
     
  2. HerrGlock

    HerrGlock Scouts Out CLM

    23,791
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    Dec 28, 2000
    Yeah "rm" is a whole like like shred. It's not all that easy to recover things even with standard rm on a *NIX system. It can be done and there are ways, but it's not that easy.

    If you really want things gone, run this

    dd if=/dev/random of=/bigfile bs=1024

    for each of your mount points. / /usr/local /home, etc. When you start getting "no space left on device" errors, delete the file you created (/bigfile) and do it again.

    DanH
     


  3. David_G17

    David_G17 /\/\/\/\/\/\/\/

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    Oct 7, 2002
    oh, ok. i was afraid rm was like a standard windows delete (generally easily recoverable).

    rm info page:
    are the linux guys who wrote the info page over-paranoid? is it much harder to recover files removed with rm than is implied?
     
  4. HerrGlock

    HerrGlock Scouts Out CLM

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    Dec 28, 2000
    It is possible. It's a whole lot easier in WIN, though. Use the dd command after you delete stuff if you want it overwritten and create a requirement for rather special stuff to undelete it.

    DanH
     
  5. HerrGlock

    HerrGlock Scouts Out CLM

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    Dec 28, 2000
    Linux guys in general are over-paranoid. It's one of the requirements of being interested in Linux ;f

    DanH
     
  6. David_G17

    David_G17 /\/\/\/\/\/\/\/

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    Oct 7, 2002
    i've noticed. perhaps the MS guys could use a little more paranoia.;)
     
  7. David_G17

    David_G17 /\/\/\/\/\/\/\/

    2,046
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    Oct 7, 2002
  8. nothingness

    nothingness singularitarian

    [*****@*****]$ kgpg --help Usage: kgpg [Qt-options] [KDE-options] [options] [File]

    Kgpg - simple gui for gpg

    Kgpg was designed to make gpg very easy to use.
    I tried to make it as secure as possible.
    Hope you enjoy it.

    Generic options:
    --help Show help about options
    --help-qt Show Qt specific options
    --help-kde Show KDE specific options
    --help-all Show all options
    --author Show author information
    -v, --version Show version information
    --license Show license information
    -- End of options

    Options:
    -e Encrypt file
    -k Open key manager
    -s Show encrypted file
    -S Sign file
    -V Verify signature
    -X Shred file

    Arguments:
    File File to open
     
  9. physicsdevil

    physicsdevil

    44
    0
    Jan 25, 2000
    California
    The reason that shred isn't effective on journaling filesystems is that it won't wipe the slack space (the unused space of any particular block on the disk). It's a relatively well known "hacker" trick to store files in slack space, making them difficult to detect. Included in the THC-SecureDelete package is a utility called sfill which will clean slack space. - http://www.thc.org/download.php?t=r&f=secure_delete-3.1.tar.gz