I understand a bit about digest authentication from here http://en.wikipedia.org/wiki/Digest_access_authentication, but I am pretty unclear on where, when or how it is used.  I can't find anything on that side of it.Where, when and why would a webmaster use it?  Does it require any extra code on a site if the server has it implemented?As you can see, I pretty much in the dark about how it is used, so any info would be helpful.Maybe this could become a FAQ
Digest Authentication - how is it used?
authentication
Apache server has mod_auth-digest that implements it.    It is more secure than basic authentication and can be used in place of it.  From the documentation:Using MD5 Digest authentication is very simple. Simply set up authentication normally, using AuthType Digest and AuthDigestProvider instead of the normal AuthType Basic and AuthBasicProvider. Then add a AuthDigestDomain directive containing at least the root URI(s) for this protection space.Appropriate user (text) files can be created using the htdigest tool.Example:<Location /private/>    AuthType Digest    AuthName private area    AuthDigestDomain /private/ http://mirror.my.dom/private2/    AuthDigestProvider file    AuthUserFile /web/auth/.digest_pw    Require valid-user</Location>