Best way to make an uncrackable passphrase, using What3words
The most important thing in a passphrase is its length, not using 'Capital letters, numbers, and symbols', like you so often hear.
So a passphrase such as
"responded impressed licks Theoldmiser444"
is uncrackable due to its length.
If you want to make a secure passphrase, just go to What3words.com, which is a website that has mapped every section of the Earth into 3m wide squares, and given each square a three word name. As a result, there are 57 TRILLION such squares on What3words.com, each with their own three word code.
So go onto the map and move away from the U.K. and into a random spot out at sea, write down the three words, and add a simple word or two of your own, and you have an uncrackable passphrase.
In the example above, I have added "Theoldmiser444" at the end, because most websites don't know the first thing about password security, and blindly copy each other, forcing you to use a capital letter, and/or a number, etc.
You should also always write down your passphrases. If you can remember more than two or three passphrases, then you are either a genius with a photographic memory (unlikely), or your passphrases are not long enough to be secure and uncrackable.
I use a simple address book, which has alphabetical tabs down the side, so I can easily find passphrases for all the websites I use. (I have about 200 passphrases.)
To my knowledge, nobody has EVER had their passphrase book stolen from their house and used illegally. Whereas THOUSANDS of people have their online accounts hacked every single day, because they use passwords instead of passphrases, and their passwords aren't long enough to be secure, because nobody is telling them the correct way to make passphrases.
to test the strength of any passphrases you make using this method, you'll see that they are incredibly secure.
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