[messaging] Issues in Schnorr DLEQ proofs

[Jeff Burdges]

Appears Privacy Pass only uses prime order curves, but this only turns up in their code.

> On 8 Jan 2020, at 14:40, Jeff Burdges <burdges at gnunet.org> wrote:
> I have not yet checked if implementations of either V(X)Ed2551 or Privacy Pass correct the cofactor spec bugs.  I have not yet either added all the references for the protocols being commented on or ported over all the reverences for the non-cofactor concerns from https://github.com/w3f/schnorrkel/blob/master/src/vrf.rs either.

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