> <@al800:0wnz.at> That been said, for private auth, one could simple make it so you can use a Fido key for login.
> 
> send the same challenge to everyone and the key calculate the answer according to it's private key
> So send the same challenge to everyone and store answer for each user.
> 
> As a bonus, one can use a Ledger instead of a Fido key

so can this be built with the monero related projects...and then expand to related platforms.