factors
can sender and receiver have a shared key in compilation?
do they need to have a new key at runtime?
are there more senders or more receivers?
what are you trying to protect this against?
for example, is https not enough? why?
Create a new pair key every mesg
They can share anything before the exchange. The best is to encrypt it with a key generate by both side then exchange ?
Exchange the encrypt key save the decrypt key
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