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Index > Projects and Ideas > Secure File Deletion

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asmfan



Joined: 11 Aug 2006
Posts: 392
Location: Russian
asmfan
This project came from the masm one. It was rewritten in fasm and improved slightly.
Just drag & drop files on executable and your unneeded any more files will be deleted permanently without any recovering.
Bug reports are welcomed;)
___________
News:
- improved command line parser.


Description: Unrecoverable file deletion
Download
Filename: Secure Erasing.rar
Filesize: 2.77 KB
Downloaded: 615 Time(s)


_________________
Any offers?


Last edited by asmfan on 10 Dec 2008, 08:43; edited 1 time in total
Post 22 Nov 2006, 22:18
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
i doubt if two rewrites are enough... If you want to really shred files, you should use something stronger
Post 22 Nov 2006, 23:05
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Filter



Joined: 08 Oct 2006
Posts: 67
Filter
And then there is still no guarantee with a journaling file system.
Post 23 Nov 2006, 03:05
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asmfan



Joined: 11 Aug 2006
Posts: 392
Location: Russian
asmfan
vid
Quote:

i doubt if two rewrites are enough

you can change the source so it will erase as much as you like. I made it 2 with notted bits set so 1st time is 0 and second one is 1...[/b]
Post 23 Nov 2006, 20:20
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Filter



Joined: 08 Oct 2006
Posts: 67
Filter
I don't really do secure wipes of files on disk. My understanding is that it doesn't work so well in NTFS anyway. If I wipe it's usually the whole partition with http://dban.sourceforge.net/.

I think the DBAN site has some good information about the way to best securely wipe information.
Post 24 Nov 2006, 03:43
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weiss



Joined: 03 Jan 2006
Posts: 25
weiss
you probably need raw file access to erase a file properly.

check out this [url="http://www.microsoft.com/technet/sysinternals/Utilities/SDelete.mspx"]here[/url] by Mark Russinovich
Post 24 Nov 2006, 09:40
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
and still it needs more than one overwrite of file. It is often possible for every byte on disk to find last few values it had
Post 24 Nov 2006, 13:44
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Filter



Joined: 08 Oct 2006
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vid wrote:
and still it needs more than one overwrite of file. It is often possible for every byte on disk to find last few values it had


What would be interesting, to change the subject a little, is if they could take advantage of this fact and allow people to double or triple the capacity of their current hard drives. I guess it wouldn't be reliable enough for that to work though.
Post 04 Jan 2007, 18:13
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
i think that technology is slow, expensive, not 100% safe, etc. etc.
Post 04 Jan 2007, 18:24
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asmfan



Joined: 11 Aug 2006
Posts: 392
Location: Russian
asmfan
I saw that technologi in work - simple 1.44MB disket could be enlarged to appr. 5MB - via restoring overwritten info... but these tests were long ago in early era)
Post 04 Jan 2007, 21:31
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f0dder



Joined: 19 Feb 2004
Posts: 3170
Location: Denmark
f0dder
All those "disk doubling" techniques always ended up with corrupted data.

Iirc, however, there were made some newer floppy hardware with better quality, that was able to store more data on a floppy, relatively safely. But forget it with standard hardware and disks.
Post 04 Jan 2007, 21:45
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kohlrak



Joined: 21 Jul 2006
Posts: 1421
Location: Uncle Sam's Pad
kohlrak
Chances are that if you want something perminantly destroyed badly enough, you're better off just taking your hard drive and trying to melt the thing (since cutting it isn't perfect) and buy a new HD. Or if you're not rich, make a file that replaces that space, cause if some one is going to that level to find what was on your HD, they just *might* stop if they see something that's STILL THERE.
Post 04 Jan 2007, 22:26
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
kohlrak: you see, and other people save few bucks for HDD and use some good thrashing utils.
Post 05 Jan 2007, 06:15
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kohlrak



Joined: 21 Jul 2006
Posts: 1421
Location: Uncle Sam's Pad
kohlrak
If that's the case, then it's probably only possible to just "thrash" using this tool and then write a file there that you don't delete.
Post 05 Jan 2007, 06:19
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Filter



Joined: 08 Oct 2006
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Filter
You can always test your ability to retrieve a file...

http://www.cgsecurity.org/wiki/TestDisk

I find that after defragmenting a hard drive it's usually fairly hard to recover the data.

Here is an open source application that does secure file deletion and empty space wipes. It might be of help to look at the source.

http://www.tolvanen.com/eraser/
Post 05 Jan 2007, 21:50
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asmfan



Joined: 11 Aug 2006
Posts: 392
Location: Russian
asmfan
New version. improved command line parser
Post 10 Dec 2008, 08:45
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