Note
This project is now archived and has been replaced by auth.pilcrowonpaper.com (GitHub repository).
The Copenhagen Book provides a general guideline on implementing auth in web applications. It is free, open source, and community maintained. It may be opinionated or incomplete at times but we hope this fills a certain void in online resources. We recommend using this alongside the OWASP Cheat Sheet Series.
If you have any suggestions or concerns, consider opening a new issue.