Yes, the information is around---in about a thousand pieces all referencing different versions. The examples I saw did not apply to 1.9.3, apparently, since the code samples are nowhere I could find in the source code.
I've already spent a lot of time trying to piece it together, and was looking for (updated) information as to the implementation to help things along. If the YAF security model was built over top of ASP.NET membership, as our site is, it shouldn't be a difficult integration.
Maybe if more time was spent organizing this information, rather than a link-referencing-a-post-referencing-a-blog, you might get fewer of these types of questions. Based on the amount of posts, I would say it's a popular topic.