Passwords really get in the way of scripts that have to automatically transfer files. They can also be annoying if you’re logging into the same machine all the time. If you create a key pair between two machines however, the account you created it for won’t have to provide a password when accessing the other machine. Note these are 1 way, meaning if you put computer A’s ssh key on computer B, A can log into B without a...

Password protecting a directory in Apache means that a username/password prompt will appear if someone trys to access any of the files in that directory, or that directory itself. They don’t have to do it every time they load a new page, if you for instance have an application in the directory, as it creates a session and saves the fact they authenticated themselves. To set this up, add the following into your apache site. Most likely it...