What are the various methods of user authentication available on the Internet?
Depends what the user is authenticating to, it can be on an apache server logging into a SQL database or just a normal auth to access a members area. Anonymous authentication allows anyone access without asking for a user name or password. Digest authentication is a new feature that operates much like Basic authentication except that the passwords are sent as a hash value Integrated Windows authentication uses hashing technology to identify the user without actually sending the password over the network. Just a few, theese are for IIS servers.