One of the problems with passwords is that users forget them. In an effort to not forget them, they use simple things like their dog’s name, their son’s first name and birthdate, the name of the current month- anything that will give them a clue to remember what their password is.
For the curious hacker who has somehow gained access to your computer system this is the equivalent of locking your door and leaving the key under the doormat. Without even resorting to any specialized tools a hacker can discover your basic personal information- name, children’s names, birthdates, pets names, etc. and try all of those out as potential passwords. To create a secure password that is easy to remember, do not use personal information, do not use real words, mix different character types, use a passphrase, and / or use a password management tool.
http://netsecurity.about.com/cs/generalsecurity/a/aa112103b.htm
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