This is hilarious, I love these. If you're tempted to use one of these as your password, you probably have to choose the first one you see in order to maintain the desired 42 bits of security. You can't keep refreshing until you find one you like since the search space for a reaaaaally good one is probably much smaller than the search space of all combinations.
(I acknowledge this site is mostly a joke and you'd be crazy to use any of these for an important password)
Do note that 42bits is way too low for a secure password. You should be targeting something over 77 bits [0], so you would need to combine 2 passphrases. Sound pretty hard to remember to me :P
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It depends entirely on your security requirements, but all in all, in broad definitions, 42 bits is not enough. Maybe if key rotation happens fast enough, faster than expected brute force, then, maybe? Again, all up to definitions and context.
Let's not forget that this "passphrase generator" is mostly a joke :D
I remember exactly one passphrase - the one to open my password manager. Sure there are other methods, but none of the alternatives work as conveniently on every type of device I need to use.
... which is, itself, unlocked by a passphrase. And, bonus points if one uses Bitwarden since one could think of the insulting unlock passphrase as directed toward their UX team :-D
(I acknowledge this site is mostly a joke and you'd be crazy to use any of these for an important password)