[messaging] Addition in place of concatenation in TripleDH

[Jeff Burdges]

TripleDH combines the three DH values by feeding them into a hash
function.  

What would be lost by using addition in the curve instead?
I.e. KDF( DH(a,b) + DH(A,b) + DH(a,B) )

I won't be doing this myself, but it appears this would be somewhat
faster as the DH operations can be done together, so I got curious.

Thanks,
Jeff


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