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Bitwarden has launched a new authenticator app
(bitwarden.com)
This is a most excellent place for technology news and articles.
How does 2FA work without an internet connection?
it's basically just a shared random number generator on a timer (it's slightly smarter than that but that's the gist), so as long as you know the start time, the current time and the starting point for the RNG, both parties can get the same result without having to ever communicate