Awesome Secure Messaging
*A curated collection of links for secure messaging. Part of the ["Awesome X" series](https://github.com/sindresorhus/awesome).*

## Table of Contents

- [Fundamentals](#fundamentals)
- [Messaging](#messaging)
- [Anonymity](#anonymity)
- [Applications](#applications)

## Fundamentals

- [SoK: Secure Messaging](http://cacr.uwaterloo.ca/techreports/2015/cacr2015-02.pdf) - evaluation of current secure messaging solutions based on security, usability and adoption

## Messaging

- [Double Ratchet](https://signal.org/docs/specifications/doubleratchet/) - two-party protocol to exchange encrypted messages based on shared key

- [X3DH](https://signal.org/docs/specifications/x3dh/) - two-party asynchronous key agreement protocol

## Anonymity

- [The Differences Between Onion Routing and Mix Networks](https://crypto.is/blog/mix_and_onion_networks) - brief comparison

- [Anonymity Trilemma: Strong Anonymity, Low Bandwidth Overhead, Low Latency—Choose Two](https://eprint.iacr.org/2017/954.pdf) - on fundamental tradeoff for anonymous communication protocols


## Applications

- [Briar](https://briarproject.org/) - messaging app employing several censorship-resitance techniques, like direct device-to-device comms (bluetooth, wifi), Tor routing