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What is the best way to derive the initial chain code for BIP-32? #134

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fjarri opened this issue Jul 18, 2024 · 0 comments
Open

What is the best way to derive the initial chain code for BIP-32? #134

fjarri opened this issue Jul 18, 2024 · 0 comments
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cryptography Needs cryptographic expertise
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v1.0.0

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fjarri commented Jul 18, 2024 •
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#132 introduced BIP-32 derivation for threshold key shares. As the initial chain code we use a hash of the full verifying key. Is this secure? Is there a better way to do it?

One option is to use the rid value that is built as a kind of a shared secret during KeyInit. Would such double-purpose usage be secure?

Also, could rid be used to support hardened derivation somehow?
@fjarri fjarri added the cryptography Needs cryptographic expertise label Jul 18, 2024
@fjarri fjarri added this to the v1.0.0 milestone Jul 18, 2024
This was referenced Jul 18, 2024
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