What's a key exchange https://www.cryptologie.net/article/496/whats-a-key-exchange/ …
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Replying to @cryptodavidw
I don’t get the “if you steal the two bottles, you can’t reconstruct the secret” part.
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Replying to @jedisct1
It’s an analogy to CDH, but it’s a bit out of the blue. What I want to explain is that you can’t passively MITM the protocol.
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Replying to @cryptodavidw
Not the best analogy IMHO. Plus, the pressure doesn’t actually change when you shake a soda.
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Replying to @jedisct1
Yeah someone mentioned that. Are you saying that the color thing is better? BTW you can do this with many things. Both side could be cooking an egg, or adding ingredients to a pot, etc.
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I wouldn’t trust a cocktail made by two parties not disclosing anything about the secret ingredients each other added. 
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