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Why social security numbers make bad passwords

For a long time now I've explained to my local users that using a social security number as a password is not a good idea. It's our corporate headquarters policy to do so. Recently, I was asked by the user that I've had changing our passwords to non-social security passwords why we are not using the social security numbers as passwords. I've tried explaining it to them as simple as possible how hackers attack a network and possibilities of disgruntled employees. Can you give any expert advice of your own as to why this is not a good idea?
You are on target. They are also easy to crack - just download the newest LophtCrack tool from @stake and test it. Number only passwords are discovered very quickly.

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