Solved

screenshot as evidence

Posted on 2014-01-17
9
493 Views
Last Modified: 2014-01-19
How can we detect if a screen shot has been edited?
Must it be of certain format (jpg, png, PDF, ...) ?
0
Comment
Question by:sunhux
  • 4
  • 4
9 Comments
 
LVL 82

Assisted Solution

by:Dave Baldwin
Dave Baldwin earned 100 total points
Comment Utility
PCs normally create JPgs, Macs create PNGs, I don't know what Linux GUI will create.  You would have to look for something that doesn't match what a known screenshot will show.  It could be very difficult to tell whether it has been edited.  One possible clue could be that the screenshot is not the same size as the screen it is supposed to be showing.  That would indicate that it has been cropped or resized.
0
 
LVL 78

Assisted Solution

by:David Johnson, CD, MVP
David Johnson, CD, MVP earned 400 total points
Comment Utility
With a skilled editor you won't see any difference even at high magnification (zoom in).  Date Time stamps can be altered. You need to have the complete chain of evidence .  From the time the screenshot is taken until it is presented as evidence. A forensic search of the hard drive that it was originally saved on can reveal older versions.  Computer graphics do not stand up well in court these days.
0
 

Author Comment

by:sunhux
Comment Utility
Right, the screen shots are needed as evidence to auditors that
certain accounts have been deleted as of a certain date/time:
my plan was to have the date+time displayed at the bottom
right corner with Windows "Users" management listed, then
take a screen shot but I was asked how do I know the screen
shots have not been altered/rigged?
0
 
LVL 78

Assisted Solution

by:David Johnson, CD, MVP
David Johnson, CD, MVP earned 400 total points
Comment Utility
Take the screen shots yourself then sign a declaration is about all you can do.
0
Get up to 2TB FREE CLOUD per backup license!

An exclusive Black Friday offer just for Expert Exchange audience! Buy any of our top-rated backup solutions & get up to 2TB free cloud per system! Perform local & cloud backup in the same step, and restore instantly—anytime, anywhere. Grab this deal now before it disappears!

 

Author Comment

by:sunhux
Comment Utility
Thought a video shot of, say, a crime taking place (say theft in a shop)
could stand in a court, or couldn't it?

Actually those screen shots are not taken by me, rather by my
Wintel colleague from a different group.
0
 

Author Comment

by:sunhux
Comment Utility
Perhaps could ask my colleague to use his iPhone to take
a very short video of his screen?
0
 

Author Comment

by:sunhux
Comment Utility
I was tasked to front the auditors
0
 
LVL 78

Assisted Solution

by:David Johnson, CD, MVP
David Johnson, CD, MVP earned 400 total points
Comment Utility
Actually those screen shots are not taken by me, rather by my
Wintel colleague from a different group.


Print the screenshot and have him sign it
0
 
LVL 78

Accepted Solution

by:
David Johnson, CD, MVP earned 400 total points
Comment Utility
A CCTV used as evidence the video is removed from the scene and a strict chain of custody is enforced.  A video of unknown parentage is unacceptable  i.e. using a green screen I can put anyone anywhere.
0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

Ransomware continues to be a growing problem for both personal and business users alike and Antivirus companies are still struggling to find a reliable way to protect you from this dangerous threat.
This paper addresses the security of Sennheiser DECT Contact Center and Office (CC&O) headsets. It describes the DECT security chain comprised of “Pairing”, “Per Call Authentication” and “Encryption”, which are all part of the standard DECT protocol.
In this video, we discuss why the need for additional vertical screen space has become more important in recent years, namely, due to the transition in the marketplace of 4x3 computer screens to 16x9 and 16x10 screens (so-called widescreen format). …
We often encounter PDF files that are pure images, that is, they do not have text characters, but instead contain only raster graphics. The most common causes of this are document scanning software and faxing software/services that create image-only…

763 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

8 Experts available now in Live!

Get 1:1 Help Now