Why is the "correct horse battery staple" advice silly?

Using memorable passphrases online is always a bad option because they're easily broken with a dictionary attack, unless you bump the number of words to the point where it becomes hard to remember the phrase. Use long strings of random characters instead, and contain the use of passphrases to unlocking your password manager.

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kbolino 9 days ago | parent [-]

To wit, each word drawn from a 10,000-word dictionary adds about 13 bits of entropy. At 4 words, you have (a little over) 52 bits of entropy, which is roughly equivalent to a 9-character alphanumeric (lower and upper) password. The going recommendation is 14 such characters, which would mean you'd need about 7 words.

	▲	daneel_w 9 days ago \| parent [-]
		The average person will create a passphrase from their personal dictionary of most-used words, amounting to a fraction of that. An attacker will start in the same way. Another problem with passphrases is that you'll have a hard time remembering more than a couple of them, and which phrase goes to what website.