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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?

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When you think up a password for yet another online account, longer is better, right?

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Well, that's true if your password is a string of random numbers, letters and symbols.

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But if you use a memorable phrase, as some sites recommend, your super-long password could be twice as easy to crack,

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assuming the password cracker knows grammar.

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Researchers created a grammar-smart algorithm and set it loose on 144 passwords, each a phrase at least 16 characters long.

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Two-and-a-half-trillion guesses later, it had cracked a quarter of them.

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And the algorithm decoded a dozen passwords state-of-the-art crackers could not.

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The researchers are presenting their program at the Conference on Data and Application Security and Privacy, or CODASPY.

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The best password crackers can guess 33 billion times a second.

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Using standard grammar cuts down the number of alphanumeric possibilities--and the time it takes to crack your password.

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Avoid pronouns and verbs, the researchers say.

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They're easy to guess because they're few in number, compared to adjectives and nouns.

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For example, "Sheblindedmewithscience" is a weaker password than "threeblindmicerhyme."

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See how the hackers run.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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