Skip to main content

Python implementation of the Axolotl ratchet protocol

Project description

Overview

The Axolotl ratchet is a protocol (similar to OTR) that provides for perfect forward secrecy in (a)synchronous communications. It uses triple Diffie-Hellman for authentication and ECDHE for perfect forward secrecy. The protocol is lighter and more robust than the OTR protocol - providing better forward and future secrecy, as well as deniability.

The protocol was developed by Trevor Perrin and Moxie Marlinspike. Its chief use currently is in the Whisper Systems TextSecure SMS package.

A nice writeup of the protocol is on the Whisper Systems Blog. You can find the most recent specification of the protocol here.

Installation instructions

If you use pip, install pyaxo with:

sudo pip install pyaxo

pyaxo will be ready for use!

If you do not use pip, first make sure that you have the following:

sudo apt-get install python-dev

pyaxo also uses python-gnupg, curve25519-donna, and passlib, and if you have setuptools installed, these packages will be downloaded and installed automatically. You may need some additional python modules as well. Check the imports list.

Finally, from pyaxo’s source folder, install with:

sudo python setup.py install

Usage

There are several examples showing usage. There are also encrypt_pipe() and decrypt_pipe() methods for use in certain applications. I haven’t put together an example using them yet, but it should be straightforward.

Protocol Update

pyaxo 0.4 was updated according to the latest (Oct 1, 2014) version of the protocol, which changed the order of the ratcheting. For that reason, old conversations (created with pyaxo < 0.4) might not work properly after the update. We suggest that users update pyaxo and restart their conversations.

Bugs, etc. should be reported to the pyaxo github issues page.

Project details


Release history Release notifications

History Node

0.8.2

History Node

0.8.1

History Node

0.8.0

History Node

0.7.7

History Node

0.7.6

History Node

0.7.5

History Node

0.7.4

History Node

0.7.3

History Node

0.7.1

History Node

0.7.0

History Node

0.6.1

History Node

0.6.0

History Node

0.5.0

History Node

0.4.6

History Node

0.4.4

This version
History Node

0.4.3

History Node

0.4.2

History Node

0.4.1

History Node

0.3.9

History Node

0.3.8

History Node

0.3.7

History Node

0.3.6

History Node

0.3.5

History Node

0.3.4

History Node

0.3.3

History Node

0.3.2

History Node

0.3

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, size & hash SHA256 hash help File type Python version Upload date
pyaxo-0.4.3.tar.gz (4.5 MB) Copy SHA256 hash SHA256 Source None Dec 11, 2015

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging CloudAMQP CloudAMQP RabbitMQ AWS AWS Cloud computing Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page