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Forensic Mission 2

PostPosted: Sat Apr 23, 2016 2:09 pm
by limdis
Requirements:
Google

You cannot solve this mission by looking for the obvious signs of a poorly photoshopped image. You will need to have an understanding of jpeg compression levels. Once you realize what you need to do the answer will virtually glow at you. For those that complete the challenge and wish to help others, be as descriptive as possible but do not post the actual name of the technique.

Do not post spoilers!

Re: Forensic Mission 2

PostPosted: Fri May 20, 2016 8:47 am
by Zeb139
Dear future readers,

If you have no idea where to start, read up on this "jay-peg" stuff: https://en.wikipedia.org/wiki/JPEG
Next, notice how you'll need a password to solve this puzzle. If I were a password, where would I hide inside an image?
Can't say much more without giving it away, really. If you were to read, I dunno, 1/4 of the wiki page, you'd likely find a bit that will lead you on the right path.

A question about the photo: Would it be possible to learn what modifications were done to the woman in the photo? I have evidence that suggest she was not present in the original photo, but I feel like editing her into the photo would have been a lot of work (especially considering how convincing it looks). I suppose I'd just like to know how the modified image was produced ^__^

Re: Forensic Mission 2

PostPosted: Fri May 20, 2016 3:56 pm
by limdis
Zeb139 wrote:A question about the photo: Would it be possible to learn what modifications were done to the woman in the photo? I have evidence that suggest she was not present in the original photo, but I feel like editing her into the photo would have been a lot of work (especially considering how convincing it looks). I suppose I'd just like to know how the modified image was produced ^__^


It was a lot of work. I wanted to make the image so convincing that you HAD to use additional techniques outside of pointing out the obvious defects of a poor photoshop. Unfortunately, determining specifics on what was actually done to the image is almost always going to be unknown. With this particular image you may have noticed "rainbowing" which is a byproduct of the image being resaved from photoshop (which it was). With the same technique used to complete this challenge you may have also noticed a grid like pattern. Some sections of the image may have been rotated, and it is usually obvious in comparison. Other editing software may leave evidence in metadata and I once saw the name of a beautify script left in the hex as a way to watermark itself. Also, in a real case the physical device used to take the picture would be requested as moving images from the original device causes contamination. If possible, a test image is taken with the device and is compared against the evidence presented to help determine the validity of the claim. All that said, unless it is blatantly obvious, the only thing that can be stated in court is the professionals opinion. It is up to the jury to decide based on that if the picture is fake or not.

Re: Forensic Mission 2

PostPosted: Fri May 27, 2016 1:24 pm
by hellow533
Of course, it's Limdis so obviously something has to be broken.

This took me way longer than it should have...

Re: Forensic Mission 2

PostPosted: Sat May 28, 2016 1:52 am
by limdis
hellow533 wrote:Of course, it's Limdis so obviously something has to be broken.

Image

Re: Forensic Mission 2

PostPosted: Sat May 28, 2016 2:06 am
by RaThE_Waz_Here
First sign of alteration would be lack of metadata from the iphone in the picture, but that seem like a dead end in this case as this mission is asking for a password, kinda at a loss after having a run at it with the usual tools..

Re: Forensic Mission 2

PostPosted: Sat May 28, 2016 1:27 pm
by hellow533
You know, this feels more like a stenography mission than a forensic one. Should it be moved there?

Re: Forensic Mission 2

PostPosted: Sat May 28, 2016 3:28 pm
by limdis
hellow533 wrote:You know, this feels more like a stenography mission than a forensic one. Should it be moved there?

No. What this mission is about is detecting if an image has been manipulated, not searching for hidden text. The only thing that could classify this as also being a stego challenge is because of I had to put in text so that the user could complete this without me having to review their findings. Forensics and stego are siblings, true. But this method in my honest opinion would not be worth the effort for attempting to communicate secretly. It's too easy to detect and honestly... it was serious pain to manipulate text into it without it being seen.

Re: Forensic Mission 2

PostPosted: Sun May 29, 2016 8:56 pm
by RaThE_Waz_Here
Massive sigh moment when you find it.
Great work on the image! :)

Re: Forensic Mission 2

PostPosted: Thu Jun 16, 2016 4:25 pm
by anonianti
I can't imagine this will be breaking rules. Just trying to save people the minor frustration I experienced.. Password is case sensitive and the mystery characters are *not letters*.

BTW, enjoyed the mission. Thanks!