delete files w/zeros

K

Ken Blake, MVP

Paul said:


Yes, really. What Plato says is absolutely correct. There are many tools
like the one you provided a link to, and they can all be reasonably
effective. However, even after their use, it's often possible to recover
overwitten data using sophisticated techniques and equipment. There are
several companies offering this service, which is expensive,

It's for this reason that the US government melts drives containing really
sensitive data in a furnace, rather than relying on such software. Such
software may be good enough for the average person (probably just
reformatting the drive is good enough the great majority of the time), but
it is *not* 100% perfect.
 
P

Paul

get this: If you delete a file to the recycle bin, then later delete it from
there, then wipe drive deleted files with PGP, they can be found and
restored with simple free undelete apps.

wtf?

I tested this several times on two different partitions. Not all files can
be found and restored, but many can. Again WTF?

Paul
 
P

Paul

let me clarify. It was only some 600,000+k mpg files that were found and
restored. This was after pgp was run twice; first with 7 passes, second with
3 or more passes. Then third pgp run with 2 passes and many of these files
could be seen and "restored" but they did not run. I did not try and fix the
mpgs after they failed to run. But know that they ran after the second
running of pgp.

The app that found and restored these is a free 200k exe that does not even
need to be installed.

what security?

paul
 
P

Plato

Paul said:
The app that found and restored these is a free 200k exe that does not even
need to be installed.

what security?

Take a guess why many companies and govts. pay the money to melt down
their old drives that have already been zero filled 7 times?
 
P

Plato

Paul said:
get this: If you delete a file to the recycle bin, then later delete it from
there, then wipe drive deleted files with PGP, they can be found and
restored with simple free undelete apps.

wtf?

You're ignoring one of the basic rules of computing. ie assume anything
you save, erase, or do can be on the front page of tomorrows newspaper.

And. Think your safe using a free proxy server to hide behind? Take a
wild guess who runs some of them.
 
P

Paul Mars

yea, but this was just too damn easy.

paul

Plato said:
Take a guess why many companies and govts. pay the money to melt down
their old drives that have already been zero filled 7 times?
 
P

Plato

Paul said:
yea, but this was just too damn easy.

Assume anything you do on a pc will be on the front page of the next
days's newspaper. No matter if you wiped your drive and put it out for
disposal.
 
P

Paul Mars

so why even make all these apps top wipe, saying each is more secure, bla
bla bla DoD and all. It is all just rubbish!

btw, I defragged and that did it. So defrag does a better job then even pgp.
Wow, do u realize what I just said? megashaft makes the best app. That's a
first !

p
 
P

Paul Mars

Does anyone have experience with Restoration.exe? If so, I have a question.

tks,
paul
 
P

Plato

Paul said:
btw, I defragged and that did it. So defrag does a better job then even pgp.
Wow, do u realize what I just said? megashaft makes the best app. That's a
first !

Grin. Yep, defrag, ie overwriting sectors with new data, is a free way
to clean the files you've deleted.
 
P

Paul Mars

thought:

If I open a file and completely change its contents, making sure that it
will be at least as large as before, then close it. Then delete it. If it is
recovered, it will be of no use, correct? Are updated files saved to the
same address?

P
 
P

Phil Robyn

Paul said:
thought:

If I open a file and completely change its contents, making sure that it
will be at least as large as before, then close it. Then delete it. If it is
recovered, it will be of no use, correct? Are updated files saved to the
same address?

P

Or maybe before you delete the file, you could just

type nul>c:\yourpath\yourfile.

to turn it into a zero-byte file and break the allocation chain....

Or before you delete it, encrypt it.
 
P

Paul Mars

more details please.

Have you followed this thread? Encryption and secure deleted files are
sometimes still recoverable. So, I am wondering what my thought would do, as
far as recovery is concerned.

paul
 
K

Ken Blake, MVP

Paul said:
Does anyone have experience with Restoration.exe? If so, I have a
question.


I'm not an expert on it, but I've used it a couple of times. Ask away.
 
P

Paul Mars

I had some question about the deletion function, but I have already
experimented. So, now I know. BTW, its a great app.

p
 

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