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[](https://labs.xwiki.com/xwiki/bin/view/Main/WebHome)
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CryptPad is the **Zero Knowledge** realtime collaborative editor.
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Encryption carried out in your web browser protects the data from the server, the cloud
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and the NSA. It relies on the [ChainPad] realtime engine.
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<!--If you'd like to know more, please read [the Whitepaper]().-->
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# Installation
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Installing CryptPad is pretty straightforward. You can read all about it in the
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[installation guide](https://github.com/xwiki-labs/cryptpad/wiki/Installation-guide).
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It also contains information on keeping your instance of CryptPad up to date.
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## Setup using Docker
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See [Cryptpad-Docker](docs/cryptpad-docker.md)
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# Security
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CryptPad is *private*, not *anonymous*. Privacy protects your data, anonymity protects you.
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As such, it is possible for a collaborator on the pad to include some silly/ugly/nasty things
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in a CryptPad such as an image which reveals your IP address when your browser automatically
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loads it or a script which plays Rick Astleys's greatest hits. It is possible for anyone
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who does not have the key to be able to change anything in the pad or add anything, even the
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server, however the clients will notice this because the content hashes in ChainPad will fail to
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validate.
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The server does have a certain power, it can send you evil javascript which does the wrong
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thing (leaks the key or the data back to the server or to someone else). This is however an
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[active attack] which makes it detectable. The NSA really hates doing these because they might
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get caught and laughed at and humiliated in front of the whole world (again). If you're making
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the NSA mad enough for them to use an active attack against you, Great Success Highfive, now take
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the battery out of your computer before it spawns Agent Smith.
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Still there are other low-lives in the world so using CryptPad over HTTPS is probably a good idea.
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# Translations
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We'd like to make it easy for more people to use encryption in their routine activities.
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As such, we've tried to make language-specific parts of CryptPad translatable. If you're
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able to translate CryptPad's interface, and would like to help, please contact us!
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You can also see [our translation guide](/customize.dist/translations/README.md).
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# Contacting Us
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You can reach members of the CryptPad development team on [Twitter](https://twitter.com/cryptpad),
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via our [GitHub issue tracker](https://github.com/xwiki-labs/cryptpad/issues/), on our
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[Matrix channel](https://riot.im/app/#/room/#cryptpad:matrix.org), or by
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[e-mail](mailto:research@xwiki.com).
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# Contributing
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We love Open Source and we love contribution. It is our intent to keep this project available
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under the AGPL license forever but in order to finance more development on this and other FOSS
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projects, we also wish to sell other licenses to this software. Before making a pull request,
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please read and
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[sign the Commons Management Agreement](https://www.clahub.com/agreements/cjdelisle/cryptpad).
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If you have any questions or comments, or if you're interested in contributing to Cryptpad, come say hi on IRC, `#cryptpad` on Freenode.
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# License
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This software is and will always be available under the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the License, or (at your option)
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any later version. If you wish to use this technology in a proprietary product, please contact
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sales@xwiki.com
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[ChainPad]: https://github.com/xwiki-contrib/chainpad
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[active attack]: https://en.wikipedia.org/wiki/Attack_(computing)#Types_of_attacks
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