If Bob (or Alice) hands his (or her) phone to the other, then if both phones are shaken in the same hand, the acceleration pattern might provide an extremely unique yet similar signature, not unlike exchanging an encryption key.

So if you want to establish a trusted relationship with another Neo user, the two phones are shaken together until the software indicates that you have generated a complex enough pattern that has been recognized on the other.

Michael, this is (I think) brilliant!

We could call it... "the handshake" (OK, anyone who doesn't know why that's funny, see http://en.wikipedia.org/wiki/Handshaking).

I wonder if we could do an Neo-iPhone handshake the same way? I heard something about Apple finally releasing an SDK for the iPhone :-) (Please, no follow-ups to this jibe, except off-list!).

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