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 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Filesystem
afo - Aggressive file obliterator
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Sylvander

Joined: 15 Dec 2008
Posts: 4399
Location: West Lothian, Scotland, UK

PostPosted: Sun 06 Mar 2016, 16:45    Post subject:  

Could you explain:
make chmod +x

What should be done, and why?
What is the +x about?
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fabrice_035


Joined: 28 Apr 2014
Posts: 534
Location: Bretagne / France

PostPosted: Sun 06 Mar 2016, 17:11    Post subject:  

Make AppRun executable, in console.

Code:

chmod +x /usr/local/apps/Afo/AppRun


Other solution, you can right click on file, select property and select execute.
show_execute.png_2016-03-06_220535.png
 Description   
 Filesize   25.18 KB
 Viewed   225 Time(s)

show_execute.png_2016-03-06_220535.png

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Sylvander

Joined: 15 Dec 2008
Posts: 4399
Location: West Lothian, Scotland, UK

PostPosted: Sun 06 Mar 2016, 19:13    Post subject:  

OK...

Used 2nd method.
It works. Very Happy
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jafadmin

Joined: 19 Mar 2009
Posts: 857

PostPosted: Sun 06 Mar 2016, 19:34    Post subject:  

@fabrice_035 ,

That app is too slick for words. Cool
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april

Joined: 14 Sep 2013
Posts: 1241
Location: Green Island baby!

PostPosted: Wed 16 Mar 2016, 17:46    Post subject:  

@jafadmin
Wow that was close
d/l instal and try but silly me ,try on a directory thinking it overwrites deleted data only.

Fortunately it did not operate on the directory and my data was safe.

Perhaps you could make that clear? It deletes and obliterates real live files , not deleted files .

Very handy though and appreciate the knowledge and effort that went in and the knowledge it imparts to me as well .
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april

Joined: 14 Sep 2013
Posts: 1241
Location: Green Island baby!

PostPosted: Wed 16 Mar 2016, 17:54    Post subject:  

jafadmin wrote:
Burn_IT wrote:

Even with data overwrite on magnetic disks it is possible (though expensive) to retrieve prior data after a few passes. That is why DOD standards say seven overwrites with different random data each time.
It is also very difficult to "clean" SSD type storage media because of the randomising. The only sure way is to delete the whole disk and force full garbage collection.


I have an associate that is a DOJ certified Forensic IT Specialist. These guys have really expensive hardware and software designed to do just exactly what you said.

According to this individual, the assertion that data can be retrieved after a disk has been overwritten, even with just one pass of zeros, is largely just a theory.

There aren't any actual proofs of this. Anywhere. Think about that. Someone would have published by now.


FWIW the theory I read was they shift the read head just slightly to one side or the other and as some shake is always present the sides can be read and distinguished from the new data.

Seems to me it could only be on hard disks and rewritable CD's and USB sticks would be safe from that.
Heard anything about prior data on USB sticks?
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Burn_IT


Joined: 12 Aug 2006
Posts: 3285
Location: Tamworth UK

PostPosted: Wed 16 Mar 2016, 18:19    Post subject:  

As far as I am aware, if a USB stick is overwritten there is no way of recovering prior data.
I did however see an article that said with very very expensive electronics it is possible to detect the previous state of a cell if all the cells had been overwritten with a single value.

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april

Joined: 14 Sep 2013
Posts: 1241
Location: Green Island baby!

PostPosted: Wed 16 Mar 2016, 21:38    Post subject:  

Fabrices app is a tad confusing

What does first icon with the red arrow do?
Nothing it seems
Where do the logs appear? Nothing in /var/logs/
So you select the line with the file on it , Select how many times you want it overwritten and then press delete. Thats the only one that does the deed?

So whats all the rest of the box needed for?

Couldn't you just leave it as jafadmin had it and it works intuitively from the command line .

Guess hes gotta say good but I think the extra app is a pointless complicated time waster or at least it needs tidying up if its meant to be a safety thing..

Last edited by april on Wed 16 Mar 2016, 21:47; edited 3 times in total
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april

Joined: 14 Sep 2013
Posts: 1241
Location: Green Island baby!

PostPosted: Wed 16 Mar 2016, 21:40    Post subject:  

Burn_IT wrote:
As far as I am aware, if a USB stick is overwritten there is no way of recovering prior data.
I did however see an article that said with very very expensive electronics it is possible to detect the previous state of a cell if all the cells had been overwritten with a single value.


Well Good , not much chance of them being in that state is there!
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Burn_IT


Joined: 12 Aug 2006
Posts: 3285
Location: Tamworth UK

PostPosted: Thu 17 Mar 2016, 11:26    Post subject:  

Well yes there is!
The null state after a format is a single value.
That is why any decent scrubber uses random changing values.

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musher0

Joined: 04 Jan 2009
Posts: 12980
Location: Gatineau (Qc), Canada

PostPosted: Thu 17 Mar 2016, 13:26    Post subject:  

@jafadmin

You wouldn't know of an afmo (aggressive forum member obliterator), Laughing
would you? (Just kidding. I'm thinking of no one in particular...) Twisted Evil

TIA.

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musher0
~~~~~~~~~~
Je suis né pour aimer et non pas pour haïr. (Sophocle) /
I was born to love and not to hate. (Sophocles)
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april

Joined: 14 Sep 2013
Posts: 1241
Location: Green Island baby!

PostPosted: Thu 17 Mar 2016, 16:01    Post subject:  

Burn_IT wrote:
Well yes there is!
The null state after a format is a single value.
That is why any decent scrubber uses random changing values.

As I have mentioned elsewhere and I think it is mentioned here . Formatting clears the addresses it doesn't clear the data . The data remains until something like AFO comes along to overwrite it with something else .

At least thats my understanding and it seems to be upheld by what I have seen in using recovery programs on both Unix and Windows .

Perhaps if you you feel otherwise you might explain as I would like to know if I am wrong . I don't think null values are written anywhere except in FAT tables and perhaps Inodes which I have yet to find and study.. Are they used anywhere else?
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Burn_IT


Joined: 12 Aug 2006
Posts: 3285
Location: Tamworth UK

PostPosted: Thu 17 Mar 2016, 16:49    Post subject:  

A quick Format clears the indexes as you say.
A Full Format, which takes some time, clears the data as well. (If I remember correctly, on hard drives it is not null but something like X'F0')

Normally nowadays the quick format is default as a full format can take hours on a large volume.

I always recommend a full format on a new volume or one that is being re-purposed as it also checks for bad sectors/cells ,marks them and substitutes spare sectors.

With an SSD that is left plugged in the garbage collection routines will clear empty cells anyway.

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april

Joined: 14 Sep 2013
Posts: 1241
Location: Green Island baby!

PostPosted: Thu 17 Mar 2016, 17:09    Post subject:  

I've got a few hard drives and USB's lying around . I'll test that out because I have not seen what you say happens ,actually happening in practice . The full format I mean .

jafadmin refers to that also and says it does not happen . I too have found original data still on supposedly fully reformatted drives
It will take me a bit to get to it though .

jafadmin wrote:
A Word To The Wise: None of these following things got rid of the original file data.
1) Reformatting failed.
2) Reformatting to a different filesystem failed
3) Deleting the partition failed.
4) Deleting the partition table failed

The only thing that worked was overwriting the partition with dd Code:
dd bs=1M if=/dev/zero of=/dev/"partition descriptor", or
dd bs=1M if=/dev/random of=/dev/"partition descriptor"
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Burn_IT


Joined: 12 Aug 2006
Posts: 3285
Location: Tamworth UK

PostPosted: Thu 17 Mar 2016, 17:21    Post subject:  

Don't use a big disk!!
It is a while since I did these tests, so I too am interested in what is done nowadays.

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