-----Original Message-----
From: Charles Dias [mailto:charlesbronsondias@hotmail.com]
Sent: 01 May 2003 13:45
To: List for Photo/Imaging Educators - Professionals - Students
Subject: Digital Photo Autentication
Hi,
I was talking to a friend, amateur photographer too, and he asked me
something I couldn´t answer ... so I´m looking for you help.
Is it possible to check if a digital photo was manipulated or not??? I
mean not visually but by some log or data recording reading from the very
image file???
<snip>
Yours,
Charles
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Hi Charles,
I don't own any digital Canon EOS but I read that some of them (at least the EOS 1D, 1Ds and probably D10) have a kind of "digital signature". Some sort of code that indicates if the picture has been modified or not.
How secure it is? Don't know but certainly somebody should be working in a way to crack it.
Cheers,
Carlos
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