#Cryptocat

Browser Instant Messaging Platform with Accessible, Encrypted Messaging

Experimental software: Don't trust with your life! Peer review appreciated.

Description

Cryptocat is a browser-based XMPP client that provides multi-user (and private) instant messaging inside chatrooms. It uses the OTR protocol for encrypted two-party chat and the (upcoming) mpOTR protocol for encrypted multi-party chat.

Target Platforms

Google Chrome: src/chrome/

Run make chrome to build a Google Chrome-loadable .zip extension.

Mozilla Firefox: src/firefox/

Run make firefox to build a Mozilla Firefox-loadable .xpi extension.

Apple Safari: src/cryptocat.safariplugin/

Apple's model makes an automated build process difficult.

Compatibility Status

  -----------------------------------------
 |             Windows   Mac      Linux    |
 |-----------------------------------------|
 | Chrome  |   Yes       Yes      Yes      |
 |---------                                |
 | Firefox |   Yes       Yes      Yes      |
 |---------                                |
 | Safari  |   Yes       Yes               |
 |---------                                |
  -----------------------------------------

Documentation & Wiki

• Threat Model
• Design and Functionality Overview
• Architecture and Lifecycle

License

Cryptocat is released under the GNU Affero General Public License (AGPL3):

Copyright (C) 2011, 2012 Nadim Kobeissi nadim@crypto.cat

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see http://www.gnu.org/licenses/.

The full license text is included in LICENSE.txt.

Notes

• The Safari code directory src/cryptocat.safariextension/ doubles as a "testing" directory where code changes are made before being pushed to Chrome and Firefox (using update.sh). As such, the directory is also loadable in Google Chrome under developer mode.
• Test builds are available in release/.

Goals

• XMPP [DONE] | Discussion, Library
• OTR [DONE] | Discussion, Library
• mpOTR | Discussion, Spec in progress. Current mutli-party encryption is handled using Cryptocat Protocol 2.0

Discussion

We have a million issues worth discussing here!

Contributors

• Lead Developer: Nadim Kobeissi
• Development Contributors: Jacob Appelbaum, Joseph Bonneau, Arlo Breault, Arturo Filasto, Fabio Pietrosanti
• Multimedia Contributors: A.J. Korkidakis, P.J. Onori, Rich Vreeland

With a warm thanks to the hard-working contributors who wish to remain anonymous.