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CryptSheet Zero-Knowledge Collaborative Spreadsheet based on ChainPad

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CryptSheet is the zero knowledge realtime collaborative spreadsheet editor. Encryption carried out in your web browser protects the data from the server, the cloud and the NSA. This project uses the JQuerySheet Spreadsheet and the ChainPad realtime engine. The secret key is stored in the URL fragment identifier which is never sent to the server but is available to javascript so by sharing the URL, you give authorization to others who want to participate.

To install:

git clone <this repo>
npm install
npm install -g bower ## if necessary
bower install
## copy config.js.dist to config.js and modify configuration (use your own mongodb instance)
node ./server.js


CryptSheet is private not anonymous. Privacy protects your data, anonymity protects you. As such, it is possible for a collaborator on the pad to include some silly/ugly/nasty things in a CryptSheet such as an image which reveals your IP address when your browser automatically loads it or a script which plays Rick Asleys's greatest hits. It is acceptable for anyone who does not have the key to be able to change anything in the pad or add anything, even the server.

The server does have a certain power, it can send you evil javascript which does the wrong thing (leaks the key or the data back to the server or to someone else). This is however an active attack which makes it detectable. The NSA really hates doing these because they might get caught and laughed at and humiliated in front of the whole world (again). If you're making the NSA mad enough for them to use an active attack against you, Great Success Highfive, now take the battery out of your computer before it spawns Agent Smith.

Still there are other low-lives in the world so using CryptSheet over HTTPS is probably a good idea.


This software is and will always be available under 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.


Realtime Collaborative Zero-Knowledge Spreadsheet based on ChainPad




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