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2FA and MFA are all very well and very good, but have you tried MMA? Mixed martial authentication is quite popular in some kung fu movies, e.g.
https://www.youtube.com/watch?v=TDhLXkRhg60
"You do not truly know someone until you fight them."
@technomancy I swear I recently saw this joke but I can't find it now.
@JordiGH the great thing about implementing MMA is that it works great with duel-licensing.
"you can use my library only if you can best me in single combat"