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

Minhaz A V minhazav at gmail.com
Fri Oct 4 09:56:17 UTC 2013


My bad just googled "stenography" and got to know Abbas and Maarten were
suggesting the same..:D


On Fri, Oct 4, 2013 at 3:21 PM, Maarten Hoogveld <m.hoogveld at elevate.nl>wrote:

> 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*
>>>>
>>>> _______________________________________________
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>>>> 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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