Add note about deterministic key generation #12
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AltmannPeter
requested changes
Apr 8, 2024
draft-bradleylundberg-cfrg-arkg.md
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| ### Deterministic key generation | ||
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| Although the above definition expresses the key generation as opaque, | ||
| likely sampling random key distributions, |
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likely sampling uniformly random key distributions,
draft-bradleylundberg-cfrg-arkg.md
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| likely sampling random key distributions, | ||
| implementations MAY choose to implement the functions `BL-Generate-Keypair()`, | ||
| `KEM-Generate-Keypair()` and `ARKG-Generate-Seed()` | ||
| as deriving keys deterministically from some given input key material. |
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"as deterministic functions for a given input."
ARKG-Generate-Seed() does not derive a key.
draft-bradleylundberg-cfrg-arkg.md
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| implementations MAY choose to implement the functions `BL-Generate-Keypair()`, | ||
| `KEM-Generate-Keypair()` and `ARKG-Generate-Seed()` | ||
| as deriving keys deterministically from some given input key material. | ||
| This can be thought of as defining a single-use ARKG instance where these functions return a constant result. |
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"This can be thought of as defining a single-use ARKG instance where these function outputs are static."
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(2024-04-03) Review comments from @AltmannPeter and @sander: There are desired use cases for deterministically generated seed keys, such as that outlined in the example here.
I don't think the defined procedures really need to change, since this is rather an implementation detail for the delegating party. I think we can just note that implementations are free to make that choice, without defining an interoperability API for this.
(A formal definition of
ARKG-Generate-Seedis needed just to tieBL-Generate-KeypairandKEM-Generate-Keypairtogether, but its implementation details are not important for interoperability, unlikeARKG-Derive-Public-KeyandARKG-Derive-Secret-Key.)