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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file. The project adheres to Semantic Versioning.

[Unreleased]

0.3.0 - 2023-10-08

(All changes are relative compared to the 0.3.0-beta.1 release)

Added

  • Add getters for participant parameters in DKG.

Changed

  • Update elliptic-curve and hashbrown dependencies.

  • Bump the minimum supported Rust version to 1.65.

0.3.0-beta.1 - 2023-02-03

Added

  • Make curve25519-dalek dependency optional and do not force the choice of its math backend. The dependency is still enabled by default.

  • Allow for the curve25519-dalek-ng crypto backend as an alternative to curve25519-dalek. This may be beneficial for applications that use bulletproofs or other libraries depending on curve25519-dalek-ng.

  • Implement zero-knowledge proof of equivalence between an ElGamal ciphertext and a Pedersen commitment in the same group. This proof can be used to switch from frameworks applicable to ElGamal ciphertexts, to ones applicable to Pedersen commitments (e.g., Bulletproofs for range proofs).

  • Implement distributed key generation (DKG) for threshold encryption based on Pedersen's scheme with commitments of participants' keys.

Changed

  • Update hashbrown dependency.

  • Bump the minimum supported Rust version to 1.62.

0.2.1 - 2022-07-04

Fixed

  • Fix serde feature. The serde dependency requires the alloc feature enabled, but this was not declared previously.

0.2.0 - 2022-06-13

Added

  • Generalize EncryptedChoice to handle multi-choice polling.

  • Add quadratic voting with a zero-knowledge proof of correctness.

  • Encapsulate ciphertext + original value in CiphertextWithValue. Allow using this type to create RangeProofs.

  • Extend supported operations for Ciphertexts, e.g. negation.

  • Expose ciphertext components via getters.

Changed

  • Update elliptic-curve dependency.

  • Return new error types (VerificationError and ChoiceVerificationError) on proof verification failure instead of signalling failure via bool or Option values.

  • Move EncryptedChoice to a separate app module. Introduce EncryptedChoiceParams to encapsulate all parameters related to EncryptedChoice creation / verification.

  • Generalize DecryptionShares as VerifiableDecryption, which can be applied not only with threshold encryption with Shamir's secret sharing, but in other sharing schemes or independently.

  • Make hashbrown an optional dependency, which is only necessary if the std library is not available.

Fixed

  • Remove unused byteorder and smallvec dependencies.

  • Avoid extra allocations when constructing ring proofs, which could leak information via side channels.

Security

  • Fix zeroing SecretKey contents on drop.

0.1.0 - 2021-06-28

The initial release of elastic-elgamal.