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I had no idea this was possible until today!

There are cryptographic protocols that can amplify a short password shared between 2 parties to a strong shared key. I thought that such violated some kind of fundamental entropy law. Nope!




Turning low-entropy inputs into random numbers is an active sub-field whose products are called extractors. They often needed at least one input to be truly random or have a certain amount of entropy. Here's an article on a recent one that improves over that:

https://www.laarc.io/item?id=530

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