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Computer Forensics World :: View topic - contract jpeg image, tampered with?
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contract jpeg image, tampered with?

 
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catlady
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Joined: Sep 21, 2012
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PostPosted: Sat Sep 22, 2012 1:42 am    Post subject: contract jpeg image, tampered with? Reply with quote

I wanted to ask if anyone knows how to analyze a jpeg image of a signed contract?
or more direction on who to contact for this type of issue?

I was told a flattened image could not have any layers extracted but possibly a bit level analysis done?

Im not in the technical world or going to school for computer forensics, I just need help to figure out if a signed contract was altered after it was signed, thanks!
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PreferredUser
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Joined: Jan 01, 2007
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PostPosted: Sat Sep 22, 2012 3:17 am    Post subject: Reply with quote

There is a site dedicated to image forensics.
h t t p : / / forensicphotoshop . blogspot . com /
If you scroll to the bottom of the home page there is contact information for Jim Hoerricks. I am not saying he is the only person that can do that type of work, however you did not provide any locality information so I am just giving you a person that is easy to contact.
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vaibhavs
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PostPosted: Sat Sep 22, 2012 8:54 am    Post subject: Reply with quote

Hello,

do you have Original copy of JPEG file ?

You can can compare Original and Other copy with regarding their Hash Values..
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popquiz
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PostPosted: Sun Sep 23, 2012 12:08 pm    Post subject: Contract Image Validation Reply with quote

Question be careful of the suggestion regarding a review of the .jpg hash value. although many .jpg file generator programs are similar, they are not always the same. there a different variables for quality of the .jpg file alone, that said one .jpg image in one light and at a specific angle will give a different hash value from another .jpg image file in similar light and a seemingly exact zoom and angle of incidence.

On a side note a flattened image can be recreated into a layered document, but it is never the original. If it is saved in a .TIFF format more can be gleaned from this and possibly provide the answers that you are looking for.
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