This is the backend for a project I made in May-June 2024. It is an end-to-end encrypted web-based chat application which uses the quantum-resistant cryptography algorithm CRYSTALS-Kyber for security.
Please note that the implementation of CRYSTALS-Kyber this project depends on has since been deprecated in favor of ML-KEM. You may wish to not deploy this project.
It isn't currently actively maintained, and hasn't been actively developed since I originally wrote it as closed source. If you're reading this, I've released the project as open source as of October 2025, mostly as an educational proof of concept, but also to showcase my experience.
This backend requires a partner frontend, located here.
First replace all instances of FRONT_HOSTNAME with your frontend's hostname and
MONGODB_HOSTNAME with the hostname of your mongodb server.
These are just in index.ts. Then, make a copy of
config.json.example and rename it to config.json. There, add your desired port and
a hash of the key used to generate invites to create an accounts. Host this backend
at a separate hostname, referred to at the frontend readme as API_HOSTNAME. Finally,
host the frontend and point it at your instance. I typically run this with PM2 via bun.
I apologize for the limited portability of this code. I hastily rewrote it in Typescript prior to release to attempt to make it a little better, but I don't intend to provide any future maintenance or documentation for this project. Commit history has been expunged to avoid exposing personally identifiable information.
To install dependencies:
bun installIf you would like a small demo image, I've attached a (quite badly) censored demo I made at the time.
