diffie-hellman-vs-ecdh

= Diffie-Hellman vs ECDH
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https://crypto.stackexchange.com/questions/29906/how-does-diffie-hellman-differ-from-elliptic-curve-diffie-hellman

<ECDH> has smaller keys. https://youtu.be/gAtBM06xwaw?t=634 mentions some interesting downsides:
* bad curves exist, while in modular, any number seems to work well. TODO why?
* TODO can't find this mentioned anywher else: <Diffie-Hellman key exchange> has a proof that there is no algorithm, <ECDH> doesn't. Which proof?

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