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
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