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E-521 is a popular curve? Are you sure you don't mean P-521? I mean I'm all for the Edwards variant but I'm fairly sure most people haven't heard of it and I'm not aware of a single popular crypto library that implements it.

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Sure, P-521, whatever. I make no claims to accurately ranking curve popularity, except I am pretty sure as a practitioner (not a cryptographer) that the P-curves are still the most popular, and that 25519 and its variants are close behind. Curve448, the Hamburg specification? That's got to fit in there somewhere too?

(I'm not trying to be snarky, just sort of expressing the sentiment of throwing up my hands after having a grip on P-256 and Curve25519).

I also didn't mean to be snarky, but E-521 is far too estoric a choice to be casually dropped in without comment. I am fairly sure BLS curves see more use :)

If we're not careful some hodlgang hooligan will have this implemented (badly) in Rust in 30 seconds!

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