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5

Is this (cryptographically) secure? That is hard to say without knowing the exact details of the bitcoin protocol (which I would like to understand better, but don't have the time at the moment). Looking at the document you linked to, the public child key is created as $\text{HMAC-SHA512}(Key = c_{par}, Data = ser_P(K_{par}) || ser_{32}(i))$. This ...

0

The main difference is that secp256r1 is a prime field curve, while secp256k1 is a Koblitz curve. Koblitz curves are known to be a few bits weaker than prime field curves, but since we are talking about 256-bit curves, neither is broken in "5-10 years" unless there's a breakthrough. The other difference is how the parameters have been chosen. In secp256r1 ...

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First secp256r1 is a random and secp256k1 is a Koblitz curve. So according to this article: Koblitz curves should be avoided, [...] as they does not have enough warranty on crypto analytic activity and effectively they are: Not part of NSA Suite-B cryptography selection Not part of ECC Brainpool selection Not part of ANSI X9.62 selection ...

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