findoranetwork/noah

Noah is a library that provide tools to create and verify public transaction with confidential data.

Noah: A Cryptographic Library for Privacy Assets

Noah is a Rust library that implements various cryptographic primitives for privacy assets. It implements two constructions:

• Maxwell construction. In 2015, a renowned blockchain developer Gregory Maxwell presented a construction of confidential transactions (CT) for a UTXO chain. We implemented it with:

  • Secp256k1 or Ed25519 for digital signatures
  • The Ristretto group over Curve25519 for Pedersen commitments
  • Bulletproofs over Curve25519

• Zerocash construction. Improved over a prior protocol Zerocoin, the Zerocash construction, firstly proposed by Ben-Sasson, Chiesa, Garman, Green, Miers, Tromer, and Virza and improved subsequently by the Zcash Foundation and Electric Coin Company (ECC), is another privacy-preserving transfer protocol over a UTXO chain. We implemented it with:

  • Secp256k1 or Ed25519 (incoming) for digital signatures
  • An inhouse variant of TurboPlonk with various optimization tricks
  • The European technique for efficient memory in zk-SNARK, using the Anemoi-Jive hashes

Thanks to all the people who already contributed!

Licensing

The primary license for Noah is the Business Source License 1.1 (BUSL-1.1), see LICENSE.

noah's Issues

Use `ark_std::test_rng` for tests

Many of the tests in this library use a ChaCha20 random number generator with a fixed seed. In other words, our test random number generator is deterministic. Although it facilitates debugging, we are concerned about how strong such testing is.

A solution is to do the following:

• pub use ark_std::test_rng in zei-algebra
• make sure that the std feature is on by default and propagates correctly in the Zei library
• replace ChaCha20Rng in tests with this

If we use a deterministic ChaCha20Rng in code that is not about tests. We should also label it, so we track our use of deterministic random number generator---they are okay for URS.

Assigned to @confuseSUN

Release versions on crates.rs

We should prepare to bump the version numbers in the Noah library to 0.5.0 and prepare a release, after asset tracing is done.