Your passwords are the keys to many things: your bank machine, your computer, your email, a server on a network. Your password helps to prove you are who you say you are, and ensures your privacy. Compromised passwords are the means by which most unauthorized (and devious) people gain access to a system. Someone logging on under your name has access not only to your computer files, but to most of the facilities of the computer system. Since tampering can have far-reaching and serious consequences, it's important to take to heart the following guidelines for choosing a password. How would you lock the front door of your home? With a luggage lock or with a deadbolt?
Never tell anyone your password – not your friends, colleagues, account manager or even your system administrator or Helpdesk -- and don't write it down. Make sure you have chosen a password that you can remember. When you are given a new account, immediately change your password to one that only you know.