Comments (4)
from celo-bls-snark-rs.
Specifically, I hope to understand if it's OK to use a non-random challenge, but a known message (e.g., the Ethereum address). Or more concretely, understand how the proof relies on the public key being the string signed.
from celo-bls-snark-rs.
Above when I said "registration oracle" I meant the algorithm in the paper they call RegP, the prover's registration algorithm. In the paper, they give the adversary oracle access to RegV, the verifier's registration algorithm, when in the registered public key model. This makes sense because my point was access to RegP would allow the adversary to succeed. The multisignature security experiment (fig. 1) reflects the real world in that in a spec we would define a non-interactive method B-Pop.RegP(sk) that only takes a local secret as input and thus cannot be used as an oracle.
In particular, B-Pop.RegP takes as input sk, computes pk, and uses sk to sign RO_p(pk). Here RO_p is different random oracle than the RO_s used to sign messages. So the message signed is in fact a random challenge; there's a unique random challenge corresponding to each pk. Signing the pk itself as in S-Pop, or using the same RO as used for signing as in BadPop, is demonstrably insecure (section 4.3).
from celo-bls-snark-rs.
We concluded the way we planned it is fine - use the Ethereum address as the fixed message.
from celo-bls-snark-rs.
Related Issues (20)
- Ensure bit encodings and reversals done in a principled manner
- Fine-grained unit tests for HashToGroup
- Add clearly defined behavior for constant values
- Add detailed documentation to each gadget
- HashToCurve: What is extra data for? HOT 4
- HashToCurve and Hasher: Add new() method HOT 3
- Migrate to arkworks
- Prove security of BLS aggregation HOT 9
- Remove num non signers from setup throughout the entire API
- Implement parallelized deserialization of large vectors in arkworks
- Expose an interface to accumulate new signatures into an existing multisignature
- Create a Go wrapper in celo-bls-go
- Make sure reduced-size scalar multiplication is efficient
- Expose interfaces to work with decompressed points HOT 1
- Support efficient streaming BLS batch verification HOT 1
- Produce benchmark reports HOT 3
- Phase 1 setup random beacon HOT 5
- Study about Plumo
- Phase 2 setup random beacon HOT 2
- Fragile dependencies on arkworks (build break for any dependent)
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