Just for your curiosity, the WTBTS also has a password policy for logging into jw.org - this is standard practice in I.T.
As a ministerial servant (who also have access, though more limited and not including BOE letters or congregation files) originally I chose the password "Genesis".
When I logged in the next time, the system informed me that this password was not allowed - presumably as it is an easy to guess word and very hackable. This would be considered a "weak password". I also tried Genesis typed backwards (sisineG) - this was also disallowed.
I was pretty much forced to choose a password that was not a word in the dictionary and also that it had to contain numbers as well as letters. I think the minimum length was 7 or 8 characters.
So for those of you thinking of trying to guess some passwords - which of course I would not endorse - then you should put down your Oxford English or Websters dictionary and start mashing the keyboard instead. Alternatively, if the phrase "rainbow tables" means anything to you, then you're way ahead anyway...