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0bin

Have a try here: 0bin.net

0bin is client side encrypted pastebin that can run without a database.

It allows anybody to host a pastebin while welcoming any type of content to be pasted in it. The idea is that one can (probably...) not be legally entitled to moderate the pastebin content as he/she has no way to decrypt it.

It's an Python implementation of the zerobin project.

How it works

When creating the paste:

  • the browser generate a random key;
  • the pasted content is encrypted with this key using AES256;
  • the encrypted pasted content is sent to the server;
  • the browser receives the paste URL and add the key in the URL hash.

When reading the paste:

  • the browser makes the GET request to the paste URL;
  • because the key is in the hash, the key is not part of the request;
  • browser gets the enrypted content et decrypt it using the key;
  • the pasted content is decrypted and code is colored.

Key points:

  • because the key is in the hash, the key is never sent to the server;
  • therefor it won't appear in the server logs;
  • all operations, including code coloration, must happens on the client;
  • the server is no more than a fancy recipient.

Technologies used

  • Python
  • The Bottle microframework
  • SJCL
  • jQuery
  • Bootstrap
  • Cherrypy (server only)

Known issues

  • 0bin use several HTML5/CSS3 features that are not widely supported. In that case we handle the degradation as gracefully as we can.
  • The "copy to clipboard" feature is buggy under linux. It's flash, so we won't fix it. Better wait for the HTML5 clipboard API to be implemented in major browsers.
  • The pasted content size limit check is not accurate. It's just a safety net, so we thinks it's ok.
  • Some url shorteners and other services storing URLs break the encryption key. We will sanitize the URL as much as we can, but there is a limit to what we can do.

What does 0bin not implement?

  • Request throttling. It would be inefficient to do it at the app level, and web servers have robust implementations.
  • Hash collision: the ratio "probability it happens/consequence seriousness" is not worth it
  • Comments: for now. It's on the todo list.