Passwords are a common form of authentication and are often the only barrier between a user and your personal information. There are several programs attackers can use to help guess or "crack" passwords, but by choosing good passwords and keeping them confidential, you can make it more difficult for an unauthorized person to access your information.

Why do you need a password?

Think about the number of personal identification numbers (PINs), passwords, or passphrases you use every day: getting money from the ATM or using your debit card in a store, logging on to your computer or email, signing in to an online bank account or shopping cart...the list seems to just keep getting longer. Keeping track of all of the number, letter, and word combinations may be frustrating at times, and maybe you've wondered if all of the fuss is worth it. After all, what attacker cares about your personal email account, right? Or why would someone bother with your practically empty bank account when there are others with much more money? Often, an attack is not specifically about your account but about using the access to your information to launch a larger attack.

One of the best ways to protect information or physical property is to ensure that only authorized people have access to it. Verifying that someone is the person they claim to be is the next step, and this authentication process is even more important, and more difficult, in the cyber world.

Passwords are the most common means of authentication, but if you don't choose good passwords or keep them confidential, they're almost as ineffective as not having any password at all. Many systems and services have been successfully broken into due to the use of insecure and inadequate
passwords, and some viruses and worms have exploited systems by guessing weak passwords.

How do you choose a good password?

Most people use passwords that are based on personal information and are easy to remember. However, that also makes it easier for an attacker to guess or "crack" them. Consider a four-digit PIN number. Is yours a combination of the month, day, or year of your birthday? Or your address or phone number? Think about how easily it is to find this information out about somebody. What about your email password