On Fri, 5 Oct 2012 16:45:14 -0300
Lucas Palma wrote:

> Kevin, as mobile devices I'm talking about smartphones and tablets. The
> picture idea can be an answer. It's a bit intrusive, but more difficult to
> be faked.

To be honest, I was joking, due to the impossible unforgeable
requirement. I doubt a phone camera will be good enough even to pickup
a large desktop screen and with picture cleanup.

If you could get enough permissions you could try finding some magic
bytes from the rom, imeis, mac addresses, touch device type,
multi-touch capability (desktops have this but rare), processor type,
device-width, perhaps pile it on so it's more effort than it's worth
etc..

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