I have to say, the short description of arithmetic circuits in elliptic curve finite fields in this blog post is probably one of the clearest and most concise I

I have to say, the short description of arithmetic circuits in elliptic curve finite fields in this blog post is probably one of the clearest and most concise I've seen. Bravo! As for the problem of user-agent sniffing, well, it is done for a reason. Probably there's less of it these days than there used to be as browsers got better and more standards compliant. I'd be interested to know why Vanguard restrict to YubiKeys, perhaps someone from the FIDO alliance can find out.