Add extra security using a personal password
Use a personal password to create an extra layer of security for a remote host computer. A personal password does not replace either an access code or a user password.
Results: When you next connect to this computer from this account you will be prompted to enter a subset of characters from the Personal Password before being granted access. Upon entering the correct characters (for example, the first, the fourth and the seventh) you are granted access.

Sample Personal Password dialog box for password