This repository contains the 'Trout-family' threshold signing protocols. All of these protocols are consistent in intending to offer scalable and efficient protocols for arbitrary thresholds, premised on class groups and worked on by Hila Dahari-Garbian, Ariel Nof, and Luke Parker.

For the implementation of class groups underlying these protocols, please see the class-groups library.

Currently implemented is Trout++, a two-round ECDSA signing protocol for arbitrary thresholds. Trout++ may be composed with ROAST to achieve a robust protocol over asynchronous networks and supports a variety of desirable features such as additive key derivation and optionally not requiring any additional setup.