akd 
An implementation of an auditable key directory (also known as a verifiable registry or authenticated dictionary).
Auditable key directories can be used to help provide key transparency for end-to-end encrypted messaging.
This implementation is based off of the protocols described in SEEMless, with ideas incorporated from Parakeet.
This library provides a stateless API for an auditable key directory, meaning that a consumer of this library must provide their own solution for the storage of the entries of the directory.
Documentation
The API can be found here along with an example for usage. To learn more about the technical details behind how the directory is constructed, see here.
Installation
Add the following line to the dependencies of your Cargo.toml:
akd = "0.9.0-pre.1"
Minimum Supported Rust Version
Rust 1.51 or higher.
Contributors
The original authors of this code are Evan Au (@afterdusk), Alex Chernyak (@alexme22), Dillon George (@dillonrg), Sean Lawlor (@slawlor), Kevin Lewi (@kevinlewi), Jasleen Malvai (@jasleen1), and Ercan Ozturk (@eozturk1). To learn more about contributing to this project, see this document.
License
This project is dual-licensed under either the MIT license or the Apache License, Version 2.0. You may select, at your option, one of the above-listed licenses.