MeeSign

An open-source platform for demonstrating threshold cryptography protocols.

The platform aims to showcase capabilities of threshold cryptography by providing users with an application that allows them to run threshold protocols through an easy-to-use graphical interface. The application performs all the supported cryptographic protocols including distributed key generation. Outputs of the protocols are indistinguishable from single-party outputs, yet they require multiple parties to be created.

Platform architecture

The platform consists of client applications running on users' devices, which connect to a server instance facilitating client communication and coordinating threshold cryptography protocols.

Client application

We provide a client application implemented in the Flutter framework, compatible with Android, Linux, Windows, and MacOS platforms.

You can download prebuilt client application or build it from sources:

• Android
• Linux
• Windows
• MacOS
• Sources

Server application

We provide a server application implemented in Rust to which users can connect with client applications. The server is available also as a docker container. For instruction on how to use it see the GitHub repository.

Currently, we do not have a publicly accessible server instance.

CA certificate of the private instance can be found here.

Authors

• Antonín Dufka: platform architecture, server implementation, FROST integration, JCFROST implementation, automated policies.
• Jiří Gavenda: GG18 integration, threshold ElGamal integration, PDF signing.
• Robin Chmelík: client UI improvements.
• Ondřej Chudáček: MuSig2 integration, JCMuSig2 implementation.
• Jakub Janků: client implementation, multi-platform build, CI/CD, smartcard support, share weighting.
• Kristián Mika: integration with cryptographic intefaces (Bridge Suite), containerization.
• Marek Mračna: secure communication layer, server persistence.
• Petr Švenda: project lead.

Acknowledgements: This work was supported by the Ministry of the Interior of the Czech Republic under grant VJ01010084 in program IMPAKT I.