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Randall is saying exactly that: Through 20 years of effort, we've successfully trained everyone to use passwords that are hard for humans to remember, but easy for computers to gue…

Case is only 8 more bits assuming you randomly assign case to all of your letters. More likely it will be only one more bit. Then requiring an extra character is equally good.

Assuming there are 1024 languages in the world you added 10 bits of entropy. That can be achieved adding an extra common word.

>Jargon helps too, and proper names. "dijkstra bicycle entonces boojum daihinmin" Instead of that, just add an extra common word: "correct horse battery staple bicycle".

You can modify slightly your sentence without loosing entropy "married greatly snake battle" becomes "a married great snake will battle". "correct horse battery staple" becomes "co…

Which is exactly the sort of terrible rules xkcd is criticizing (paraphrasing glenra). Instead of 4 extra enforcements you could add 8 extra characters. Your entropy is (somewhat s…

Then the space would be "the obeisance to the stupid website piece". Note that the entropy of "correct horse battery staple" is only one bit more than "correcthorsebatterystaple".