[OWASP_PHPSEC] [Offtopic] Decrypting information out of an image

Maarten Hoogveld m.hoogveld at elevate.nl
Fri Oct 4 09:51:20 UTC 2013


Just a tip to prevent you spending hours looking at difficult to read text,
it's possible to solve in under 5 minutes.


--
Met vriendelijke groet, Kind regards,
Maarten Hoogveld
Elevate BV


On Fri, Oct 4, 2013 at 11:47 AM, Minhaz A V <minhazav at gmail.com> wrote:

> Shivam,
> out of curiosity I downloaded this image from doc and opened it in
> notepad++ and while going through its source I found something strange.
> It had a lot of English words which included those like *Typeenum,
> bottomOutsetlong, printOutputOptions*
> which are not available in normal images so just have a look if this can
> be of any help (otherwise I doubt this has something to do with Photoshop).
>
>
> Regards,
> Minhaz
>
>
> On Fri, Oct 4, 2013 at 2:40 PM, Maarten Hoogveld <m.hoogveld at elevate.nl>wrote:
>
>> Hi Shivam,
>>
>> You could dive into converting the image in a 2-D array of intensity
>> values and maybe even extracting the R, G and B channels separately. Then
>> analyze that data for patterns and slight deviations which could indicate
>> steganography of some sort.
>> However, I would first pick the low hanging fruit and just look at the
>> image. I see that the image is white with a very light grid. You could try
>> to load the image in gimp <http://www.gimp.org/> or paint.net<http://www.getpaint.net/>and see if you can see something more when you zoom in so you can see
>> individual pixels or adjust contrast, etc.
>> Good luck!
>>
>>
>> --
>> Met vriendelijke groet, Kind regards,
>> Maarten Hoogveld
>> Elevate BV
>>
>>
>> On Thu, Oct 3, 2013 at 10:08 PM, Shivam Dixit <shivamd001 at gmail.com>wrote:
>>
>>> Hello all
>>>
>>> Not much discussions on this list nowdays, so I thought of sharing one
>>> of the questions which I came across recently in college CTF, and was
>>> unable to solve it.
>>>
>>> The question is the image below :
>>>
>>>
>>> https://docs.google.com/file/d/0B4G8EjUmqNchUlg1cGI3UFl4SEE/edit?usp=sharing
>>>
>>> (Image is white, with some grids)
>>>
>>> I have to decrypt some information out of it. I am not able to think
>>> from where to start. I am *not* good at Image processing. Please give
>>> me some suggestions on how to start ?
>>>
>>>
>>> --
>>> *Cheers,*
>>> *Shivam*
>>>
>>> _______________________________________________
>>> OWASP_PHP_Security_Project mailing list
>>> OWASP_PHP_Security_Project at lists.owasp.org
>>> https://lists.owasp.org/mailman/listinfo/owasp_php_security_project
>>>
>>>
>>
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>>
>>
>
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