ubuntu: destroy a huge binary file and make it non-readable.

[robert rottermann]

hi Nandakumar,
can you tel us a bit more about that program
is there a repository somewher so we migth use/help to debut it?
thanks
robert
On 26.01.2014 12:34, Nandakumar wrote:
> This package may help you:
> https://launchpad.net/gopanam/+download
>
> You encrypt the file with a key, and if the key is unknown, even the
> developer can't decrypt it.
>
> On 1/26/14, John R. Sowden <jsowden at americansentry.net> wrote:
>> On 01/26/2014 01:51 AM, Johnny Rosenberg wrote:
>>> 2014-01-25 ping song <songpingemail at gmail.com
>>> <mailto:songpingemail at gmail.com>>
>>>
>>>      thanks.
>>>      but guess I haven't make it clear.
>>>
>>>      my goal is to :
>>>      1) not to delete the file, not to chmod either
>>>      2) don't change the file size either
>>>      3) make the gzip file not being able to ungzipped and viewed -
>>>      just to mess up the file and make it not usable (what I meant
>>>      "destroy").
>>>
>>>      I finally use GNU "head" to delete the last a couple of lines like
>>>      this:
>>>
>>>      head --lines=-100 myfile.gz > newfile.gz
>>>
>>>      after this , gzip can't recogize it. that's it.
>>>
>>>      but , I doubt this is not the safe way, coz an gzip expert might
>>>      be easily open the binary file and fixed the missed lines (I'm not
>>>      sure).
>>>
>>>      maybe I better 'sort' the whole file, or, swap randomly some
>>>      lines, so there is no way the file can be read...
>>>
>>>
>>>
>>> I know this is way off topic, but I'm just curious: Why do you want to
>>> do this? Is the file ever going to be readable again? If not, why not
>>> just delete it...? If you want to be able to open the file yourself
>>> but nobody else, why not just protect it (encrypt it) with a password?
>>>
>>> Johnny Rosenberg
>>>
>>>
>>>
>>>
>>>      On Sat, Jan 25, 2014 at 12:09 PM, Liam Proven <lproven at gmail.com
>>>      <mailto:lproven at gmail.com>> wrote:
>>>
>>>          On 25 January 2014 16:17, ping song <songpingemail at gmail.com
>>>          <mailto:songpingemail at gmail.com>> wrote:
>>>          > may sounds like a sin, but I just wanna know the best way to
>>>          change a binary
>>>          > file without actually open it (since it's really huge)?
>>>
>>>          Your subject says "destroy". To me that would seem to mean
>>>          securely erase.
>>>
>>>          But your body text seems to ask about editing it.
>>>
>>>          As such, I do not understand what you mean.
>>>
>>>          If you do mean secure erase, read this:
>>>
>>>
>>> http://askubuntu.com/questions/57572/how-to-delete-files-in-secure-manner
>>>
>>>
>>>          --
>>>          Liam Proven . Profile: http://lproven.livejournal.com/profile
>>>          Email: lproven at cix.co.uk <mailto:lproven at cix.co.uk> .
>>>          GMail/G+/Twitter/Flickr/Facebook: lproven
>>>          MSN: lproven at hotmail.com <mailto:lproven at hotmail.com> .
>>>          Skype/AIM/Yahoo/LinkedIn: liamproven
>>>          Tel: +44 20-8685-0498 <tel:%2B44%2020-8685-0498> . Cell: +44
>>>          7939-087884 <tel:%2B44%207939-087884>
>>>
>>>
>> we're all sitting on the edge of our chairs waiting for this answer :)
>>
>>