--- Day changed Sat Nov 14 2015
00:34 < sipa> gmaxwell: i don't understand; ECDH is a group operation, Jacobi is a field property
00:38 < gmaxwell> sipa: my momentairily stupid belief was that if multiply by n map swapped the jacobi sign on the original point, that it would also be swapping the sign on the point on the isomorphic curve.
00:39 < sipa> you would
00:40 < sipa> because flipping the jacobi sign is just negation
00:40 < sipa> which does carry over the group
00:40 < gmaxwell> And if so, if our input were P.x and jacobi-sign, then we could end up with  nP.x, new jacobi sign.
00:40 < sipa> oh, no, that won't work
00:41 < gmaxwell> Right. it doesn't but I thought for a moment that it did. :)
00:41 < sipa> as point multiplication involves more than just group multiplication
00:42 < gmaxwell> I was thinking that it works for a dumb reason,  I tried with P and -P  and found that multiply by n ... obviously, did the same thing to their y jacobi. :)
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