I was the one that programmed "Amex Blue" each one has an x509
certificate in it, but due to size restrictions, they had requested
the use of ECC (elliptic curve cryptography) instead of DH or RSA.
This is quite possible. How do you prevent someone from tampering
with it? You take a hash of the picture, and then you include that
with the picture as supplimental information. You then sign the
hash with the digital certificate. The math is such that it's near
impossible to fake, but easy to verify.
You can also do this for future formats, and be guaranteed that you
would know if your picture got ripped off... You can prove in a
court that YOUR CAMERA took that picture...
This leads to problems of course, I borrow a camera, and I take a
few pics. Who owns it? It now becomes, he who holds the camera,
owns the pictures... not the photographer. So if I borrow a camera
from Samy's or B&H, all the photos I take from it are theirs, which
is not correct. Also, if the camera breaks, no way to verify now..
Albert
Of course the next step is a built in retinal scanner in the eyepiece
which will add the photographers retinal info to the code.
--
Winsor Crosby
Long Beach, California
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