add verifiable key resharing module #1
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* frost-core: expose SigningKey::to/from_scalar() * Update frost-core/CHANGELOG.md
…on#599) Bumps [reviewdog/action-actionlint](https://github.com/reviewdog/action-actionlint) from 1.40.0 to 1.41.0. - [Release notes](https://github.com/reviewdog/action-actionlint/releases) - [Commits](reviewdog/action-actionlint@v1.40.0...v1.41.0) --- updated-dependencies: - dependency-name: reviewdog/action-actionlint dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3.1.4 to 4.0.1. - [Release notes](https://github.com/codecov/codecov-action/releases) - [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md) - [Commits](codecov/codecov-action@v3.1.4...v4.0.1) --- updated-dependencies: - dependency-name: codecov/codecov-action dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Bumps [release-drafter/release-drafter](https://github.com/release-drafter/release-drafter) from 5 to 6. - [Release notes](https://github.com/release-drafter/release-drafter/releases) - [Commits](release-drafter/release-drafter@v5...v6) --- updated-dependencies: - dependency-name: release-drafter/release-drafter dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
…ation#610) --- updated-dependencies: - dependency-name: curve25519-dalek dependency-type: direct:production ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
The new file was missing from a hardcoded list of files whose code is duplicated automatically for every ciphersuite crate.
The gencode utility does not copy the top-level module header comment.
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The extra commits here are from upstream |
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Please don't merge this yet. I'm still working on adding additional features, like per-commitment and per-share verification (so blame can be assigned for misbehaving peers) |
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This PR implements Wang's Verifiable Secret Redistribution (VSR) Scheme to allow resharing of FROST shares, with protection against active adversaries. See ZcashFoundation#519 for research and justification. Also see ZcashFoundation#245 for related work.
This enables threshold modification, signer identifier changes, share revocation, and other cool downstream use-cases.
Also see ZcashFoundation#570, which was closed due to insufficient upstream bandwidth plus lack of formal proofs of security.
Warning
Chelsea points out that extending VSR into an environment with untrusted adversaries as co-signers is complicated. This should be addressed with a formal proof of security before this code goes into production. Without such a proof, this can only be used in environments where FROST signers trust each other.