multi-party-schnorr 0.1.1

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Multi Party Schnorr Signatures (python extension)

• Aggregated Signatures: {n,n} scheme based on simple_schnorr_multi_signatures_with_applications_to_bitcoin and the scheme for discrete-logs (section 5) from compact_multi_signatures_for_smaller_blockchains

• not implement Multi-signature scheme based on Micali-Ohta-Reyzin: Accountable-Subgroup Multisignatures. This code is being used currently for 2p-Schnorr key management.

• Threshold Schnorr scheme based on provably secure distributed schnorr signatures and a {t,n} threshold scheme. For more efficient implementation we used the DKG from Fast Multiparty Threshold ECDSA with Fast Trustless Setup. The cost is robustness: if there is a malicious party out of the n parties in DKG the protocol stops and if there is a malicious party out of the t parties used for signing the signature protocol will stop.

• The implementations aim to be bip-schnorr compliant.

• Paper List, Wiki.

Disclaimers:

(1) This code should not be used for production at the moment.

(2) This code is not secure against side-channel attacks

(3) The code do not contain a network layer (if you are interested, check white-city for ongoing effort, contribtutions are welcome)

Get Started

schnorr_bip_test_vector_2

schnorr_two_party_signing

threshold 3 out of 5 with 4 parties in signing

Install

Please use python3.5 or more
Install by pip pip3 install --user git+http://github.com/namuyan/multi-party-schnorr.git
How to use? please look at examples *.py
Cannot use on windows? please read a issue/39

Development Process

This contribution workflow is described in CONTRIBUTING.md.

Contact

For any questions, feel free to email us.

License

The library is released under the terms of the GPL-3.0 license. See LICENSE for more information.