[Cryptography] WhatsApp: Why asymmetric key instead of symmetric keys?

[Tony Arcieri]

PSK authentication would only cover the case where users want to exchange
keys in person, which in practice has been shown to be a very small number
of people. WhatsApp is targeting over a billion users: asking a billion
people to do an in-person PSK exchange with all of their contacts is a
nonstarter.

-- 
Tony Arcieri
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