I'm not certain I know the answer to this question: Why Diffie-Hellman? Why not encryption of the shared secret (RSA/ECIES)? What specific benefits does DH agreement have above and beyond that?
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great talk by colm at reinforce btwhttps://twitter.com/daniel_bilar/status/1151198899966812160 …
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The ephemeral values in ECDH are essentially regular keypairs, they're just "throw-away" keypairs. Easily done since ECC keygen is trivial, and ECDH is quite fast. Then the long term keypair signs the short term public key to authenticate.
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