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delete file in safe way ?

Computer forensics discussion. Please ensure that your post is not better suited to one of the forums below (if it is, please post it there instead!)
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delete file in safe way ?

Post Posted: Sun Mar 12, 2017 4:58 pm

hello all ... and good evening
i want to delete some files and flders from my PC how i can do that ?? without leaving any chance to anyone to recover them ?  

Senior Member

Re: delete file in safe way ?

Post Posted: Sun Mar 12, 2017 6:03 pm

You can do that with "File Shredder". www.fileshredder.org/
File Shredder is released under GNU/GPL General Public License. It is free for both personal and commercial use. With File Shredder you can remove files from your hard drive without fear they could be recovered. In File Shredder you can choose between 5 different shredding algorithms, each one gradually stronger than the previous one. Default is DoD 5220-22.M (3 passes), but Gutman algorithm is also available (35 passes). However, this will take some more time Smile

The DoD 5220.22-M data sanitization method is usually implemented in the following way:

Pass 1: Writes a zero and verifies the write
Pass 2: Writes a one and verifies the write
Pass 3: Writes a random character and verifies the write
ICT Security Manager, CHFI, CEH, ECSA, Netherlands 


Re: delete file in safe way ?

Post Posted: Sun Mar 12, 2017 10:44 pm

Overwriting once is generally enough to wipe out information, earlier wiping recommendations to overwrite N-times refers to older drives that were built differently.

There is now built in wipe capabilities that can be activated fast through special software:

While a write-in-place works on mechanical drives, on an SSD there is no guarantee that it will wipe data because of wear-levelling. Instead, simply filling the drive with data to the last block will make it impossible to recover data from it.

Physical destruction is much fastest - and more fun:

Senior Member

Re: delete file in safe way ?

Post Posted: Mon Mar 13, 2017 10:22 am

Short of total physical destruction you probably can't be assured of data deletion. There are lots of ways data could persist beyond simply being overwritten and this is what keeps digital forensics in business. Examples could include:

a. Orphaned file fragments from previous operations on a file

b. Fragments in volume shadow copies (Windows)

c. Fragments in bad sectors or mapped out sectors

For these reasons I would be very cautious about any software that claims to selectively erase files in a live file system. For most practical purposes a complete reformat of a non-SSD drive will make meaningful data recovery pretty unlikely. Similarly most recent ATA/SATA drives support a command to perform a "secure" erase. This is similar to a format but performed by the drive firmware itself.



Re: delete file in safe way ?

Post Posted: Mon Mar 13, 2017 3:23 pm

- Thomas
Default is DoD 5220-22.M (3 passes),

It should perhaps be noted that the current version of this document (http://www.dss.mil/documents/odaa/nispom2006-5220.pdf) does not contain any such statement. It does say that sanitizion must be done, but leaves it to a 'Cognizant Security Authority' to issue the instructions for how to perform it.

It seems that earlier versions quoted related contents, but as it has been removed, citing this particular document is not useful anymore.

Starman (Daniel Sedory) has already made that point in 2008: thestarman.pcministry.com/asm/5220/

And he also cites what appears to be the current source for that earlier NISPOM recommendation of three passes. Today it only accepts degaussing and physical destruction. Overwriting is presumably no longer considered secure for the Defense Security Service.  

Senior Member

Re: delete file in safe way ?

Post Posted: Sun Mar 19, 2017 5:30 pm

thank u very much all that help me Very Happy  

Senior Member

Re: delete file in safe way ?

Post Posted: Wed Mar 22, 2017 5:07 am

Dear Senior Member,

Apologize for delay!

Thanks for the question and happy that you are really concerned to your confidential data. Very Happy

Absolutely agree with the views of other members, deleting files with the data overwritten method is considered most secure and effective. I called it Eco-friendly way of file deletion.

By this way, you can free up your disk space which can be reused in future.

Few of the reputed software which you may try are:-
2) BitRaser
3) Eraser

Hope you remove your files safely...  


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