okay so you know how you can communicate perfectly securely with someone if you've ever met up with them once to exchange a sufficiently long one-time-pad
real human communication is like that only what you exchange when you meet up in person is like ineffable nonverbal stuff
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tangent math question,
is there a one-time-pad-like thing for message authenticity instead of secrecy?
(arguably the examples of respect/anger are about authenticity, not secrecy)
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yes, a one time pad is simply a forward-secret preshared key algorithm. keys can be used for both encryption and signing, depending on whether private or public keys get shared. the thing is there isn't much use for a forward secret public key, unless you may be impersonated
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