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US-CERT Cyber Security Tips: Choosing and Protecting Passwords (3/3)  
Author: Max : 2007/10/2 Printer Friendly Page Tell a Friend
Choosing and Protecting Passwords 

How can you protect your password?

Now that you've chosen a password that's difficult to guess, you have to make sure not to leave it someplace for people to find. Writing it down and leaving it in your desk, next to your computer, or, worse, taped to your computer, is just making it easy for someone who has physical access to your office. Don't tell anyone your passwords, and watch for attackers trying to trick you through phone calls or email messages requesting that you reveal your passwords.

If your Internet service provider (ISP) offers choices of authentication systems, look for ones that use Kerberos, challenge/response, or public key encryption rather than simple passwords (see Understanding ISPs and Supplementing Passwords for more information). Consider challenging service providers who only use passwords to adopt more secure methods.

Also, many programs offer the option of "remembering" your password, but these programs have varying degrees of security protecting that information. Some programs, such as email clients, store the information in clear text in a file on your computer. This means that anyone with access to your computer can discover all of your passwords and can gain access to your information. For this reason, always remember to log out when you are using a public computer (at the library, an Internet cafe, or even a shared computer at your office). Other programs, such as Apple's Keychain and Palm's Secure Desktop, use strong encryption to protect the information. These types of programs may be viable options for managing your passwords if you find you have too many to remember.

There's no guarantee that these techniques will prevent an attacker from learning your password, but they will make it more difficult.


Authors: Mindi McDowell, Jason Rafail, Shawn Hernan
 Page: 1 2 3 

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