Hiding Strings In Pictures 2

[fischadler]

I once read in a Tek Tips thread that it is possible to write hidden strings inside a JPG and then retrieve it later. I cannot find the thread any more.
Does anyone know how this can be done?

Thanks

-Fischadler

 

[strongm]

The word you want to google on is steganography

 

[fischadler]

OK Strongm,
A search in Google lead me to this site:

http://www.planet-source-code.com/vb/scripts/ShowCode.asp?lngWId=1&txtCodeId=61511

It's security is quite overkill for me but I should find a way to adapt it for my needs. I just need a way to save the app installation date to make it expire after a certain amount of days.

The project in this link also contains some bugs when it comes to saving the pictures.


Thanks!

-Fischadler

 

[HarleyQuinn]

If you do a search on this forum for steganography (as per strongm's post) you return several examples. There was one I intergated into a project of mine a while ago. Can't find the code or remember who posted it but it worked like a charm.

Hope this helps

HarleyQuinn
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[ADoozer]

alt255 posted code in thread222-530751

If somethings hard to do, its not worth doing - Homer Simpson

 

[ADoozer]

and here is the picture with the message in, since it doesnt seem to be hosted any more.

If somethings hard to do, its not worth doing - Homer Simpson

 

[chiph]

Frank Zappa, cool.

But probably should have used a color photo, the magenta pixels show up pretty clearly on B&W. Or maybe that was to illustrate that it contained the hidden data?

Chip H.


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[fischadler]

OK. The code is not very long. Let's see if I can manage to understand it enough to figure out how to write.

Thanks!

-Fischadler

 

[BobRodes]

Interviewer: Mr Zappa, you have long hair. Does that make you a woman?
Zappa: You have a wooden leg. Does that make you a table?