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“4”

hey chatgbg what is a “private key”

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As someone from Gothenburg, Sweden (often referred to as gbg) I shall answer:

A private key is a tiny number you don't need to share publicly because it is easy enough to guess.

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Maybe they were counting on the fact that usually the right answer to “I’m thinking of a number between 1 and 10” is “7”.
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Isn't 4 simply 2 bits?

Silly 2-bit outfit.

Maybe it's 3 bits.

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I think the way that the bits are counted is based on the pool from which the number was randomly drawn. So it's possible they had 256 bits of entropy but got really unlucky.
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Their other keys are also in 0..255 range. This is definitely not "really unlucky."

I guess they used (x `mod` 256) instead of (x `mod` (2^256)).

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