“When there’s that much at stake you just don’t lose or forget the password! Writing it on piece of paper is not enough.”
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One good and simple way is to take an easily remembered long phrase like “Four score and seven years ago our fathers brought forth on this continent” and use the first letter of each word. If you need to include numbers or other symbols, don’t use ones that now attached to you personally (address, soc sec #, etc). Use something like the last four digits of your childhood friend’s phone number or the channel number of the TV station you used to watch Sat morn cartoons on.