Good and Bad Passwords How-To
An Example List of Common and Bad Passwords
I have removed the long list of common passwords due to excessive traffic levels,
and may restore it sometime after they return to normal. I wish I had never
created this list, even though it has become by far the most popular page on this site.
All such lists are intellectually dishonest, regardless of how accurate they
may be, or how carefully they were prepared. Most people who do not find
their password in such a list develop a false sense of security. The simple fact
is that any competent cracker will be working from a list many times larger than
the largest common password list, and the cracker's list will include virtually
every word in any common password list. If your password can be found in any
dictionary or online "word" list, where words include such character sequences as
"qwerty", "abcd1234", or "thx1138", you have a password just as bad a those
listed in common password lists. If you have made any or several transformations
(such as described in Craking Tool Feature
List) you still have a bad password.
It's not easy to make a good passwords. There is common
advice on forming good passwords, but while better than nothing, leaves much to
be desired. If you can get through this long and sometimes technical
section you will know what makes strong or weak passwords and have a pretty
good idea when a fair password is OK, and when you need a really strong password.
The one constant is that good passwords don't appear in any word list, and have
certain minimum length and character diversity requirements. The less character
diversity, the longer the password needs to be. An all lower case password may
be OK, but should be about 18 characters to be strong.
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