Proposals for changes in the Tor protocols

This "book" is a list of proposals that people have made over the years, (dating back to 2007) for protocol changes in Tor. Some of these proposals are already implemented or rejected; others are under active discussion.

If you're looking for a specific proposal, you can find it, by filename, in the summary bar on the left, or at this index. You can also see a list of Tor protocols by their status at

For information on creating a new proposal, you would ideally look at 001-process.txt. That file is a bit out-of-date, though, and you should probably just contact the developers.