📅 Original date posted:2014-03-29
📝 Original message:On Saturday, 29 March 2014, at 4:51 am, Matt Whitlock wrote:
> On Saturday, 29 March 2014, at 9:44 am, Tamas Blummer wrote:
> > I used Shamir's Secret Sharing to decompose a seed for a BIP32 master key, that is I think more future relevant than a single key.
> > Therefore suggest to adapt the BIP for a length used there typically 16 or 32 bytes and have a magic code to indicate its use as key vs. seed.
>
> Master keys of 32 bytes would work as-is, as ordinary private keys are also 32 bytes. Secrets of other lengths could be supported if the function that generates a[i] from a[i-1] (which is presently SHA-256) were replaced with a function having parameterized output length, such as scrypt.
Actually, secrets with value greater than secp256k1_N cannot be supported because the modular arithmetic would destroy them. But any secret smaller than 256 bits would be fine.
Matt Whitlock [ARCHIVE] /
npub17q…upwet
2023-06-07 15:16:39
in reply to nevent1q…e6wu
Author Public Key
npub17qxssk9sj2r7jswvh3y32e7vwz7mcckhz33gk9nurdmw0lhsfkgswupwetPublished at
2023-06-07 15:16:39Event JSON
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"content": "📅 Original date posted:2014-03-29\n📝 Original message:On Saturday, 29 March 2014, at 4:51 am, Matt Whitlock wrote:\n\u003e On Saturday, 29 March 2014, at 9:44 am, Tamas Blummer wrote:\n\u003e \u003e I used Shamir's Secret Sharing to decompose a seed for a BIP32 master key, that is I think more future relevant than a single key.\n\u003e \u003e Therefore suggest to adapt the BIP for a length used there typically 16 or 32 bytes and have a magic code to indicate its use as key vs. seed.\n\u003e \n\u003e Master keys of 32 bytes would work as-is, as ordinary private keys are also 32 bytes. Secrets of other lengths could be supported if the function that generates a[i] from a[i-1] (which is presently SHA-256) were replaced with a function having parameterized output length, such as scrypt.\n\nActually, secrets with value greater than secp256k1_N cannot be supported because the modular arithmetic would destroy them. But any secret smaller than 256 bits would be fine.",
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