Just a friendly warning that comic is bullshit. 
You would need at least 8 random words to have about the same security as 12+ random characters. The entropy maybe higher
You would need at least 8 random words to have about the same security as 12+ random characters. The entropy maybe higherThe comic didn't say 12 random characters. Most people don't use 12 random characters for their password. So was the problem the example in the comic or your understanding of the example in the comic?
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but every serious hacker uses rainbow tables, dictionaries or even phrases from common digitalized books...
which is useful against a set of random words how?