Lorrie Faith Cranor: What's wrong with your pa$$w0rd?

139,435 views ・ 2014-06-24

TED


Please double-click on the English subtitles below to play the video.

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I am a computer science and engineering professor here at Carnegie Mellon,
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and my research focuses on usable privacy and security,
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and so my friends like to give me examples
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of their frustrations with computing systems,
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especially frustrations related to
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unusable privacy and security.
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So passwords are something that I hear a lot about.
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A lot of people are frustrated with passwords,
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and it's bad enough
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when you have to have one really good password
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that you can remember
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but nobody else is going to be able to guess.
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But what do you do when you have accounts
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on a hundred different systems
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and you're supposed to have a unique password
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for each of these systems?
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It's tough.
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At Carnegie Mellon, they used to make it
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actually pretty easy for us
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to remember our passwords.
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The password requirement up through 2009
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was just that you had to have a password
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with at least one character.
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Pretty easy. But then they changed things,
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and at the end of 2009, they announced
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that we were going to have a new policy,
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and this new policy required
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passwords that were at least eight characters long,
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with an uppercase letter, lowercase letter,
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a digit, a symbol,
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you couldn't use the same character more than three times,
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and it wasn't allowed to be in a dictionary.
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Now, when they implemented this new policy,
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a lot of people, my colleagues and friends,
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came up to me and they said, "Wow,
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now that's really unusable.
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Why are they doing this to us,
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and why didn't you stop them?"
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And I said, "Well, you know what?
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They didn't ask me."
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But I got curious, and I decided to go talk
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to the people in charge of our computer systems
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and find out what led them to introduce
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this new policy,
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and they said that the university
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had joined a consortium of universities,
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and one of the requirements of membership
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was that we had to have stronger passwords
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that complied with some new requirements,
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and these requirements were that our passwords
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had to have a lot of entropy.
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Now entropy is a complicated term,
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but basically it measures the strength of passwords.
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But the thing is, there isn't actually
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a standard measure of entropy.
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Now, the National Institute of Standards and Technology
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has a set of guidelines
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which have some rules of thumb
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for measuring entropy,
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but they don't have anything too specific,
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and the reason they only have rules of thumb
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is it turns out they don't actually have any good data
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on passwords.
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In fact, their report states,
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"Unfortunately, we do not have much data
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on the passwords users choose under particular rules.
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NIST would like to obtain more data
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on the passwords users actually choose,
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but system administrators are understandably reluctant
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to reveal password data to others."
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So this is a problem, but our research group
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looked at it as an opportunity.
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We said, "Well, there's a need for good password data.
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Maybe we can collect some good password data
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and actually advance the state of the art here.
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So the first thing we did is,
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we got a bag of candy bars
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and we walked around campus
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and talked to students, faculty and staff,
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and asked them for information
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about their passwords.
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Now we didn't say, "Give us your password."
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No, we just asked them about their password.
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How long is it? Does it have a digit?
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Does it have a symbol?
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And were you annoyed at having to create
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a new one last week?
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So we got results from 470 students,
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faculty and staff,
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and indeed we confirmed that the new policy
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was very annoying,
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but we also found that people said
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they felt more secure with these new passwords.
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We found that most people knew
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they were not supposed to write their password down,
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and only 13 percent of them did,
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but disturbingly, 80 percent of people
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said they were reusing their password.
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Now, this is actually more dangerous
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than writing your password down,
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because it makes you much more susceptible to attackers.
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So if you have to, write your passwords down,
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but don't reuse them.
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We also found some interesting things
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about the symbols people use in passwords.
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So CMU allows 32 possible symbols,
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but as you can see, there's only a small number
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that most people are using,
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so we're not actually getting very much strength
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from the symbols in our passwords.
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So this was a really interesting study,
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and now we had data from 470 people,
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but in the scheme of things,
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that's really not very much password data,
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and so we looked around to see
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where could we find additional password data?
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So it turns out there are a lot of people
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going around stealing passwords,
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and they often go and post these passwords
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on the Internet.
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So we were able to get access
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to some of these stolen password sets.
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This is still not really ideal for research, though,
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because it's not entirely clear
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where all of these passwords came from,
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or exactly what policies were in effect
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when people created these passwords.
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So we wanted to find some better source of data.
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So we decided that one thing we could do
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is we could do a study and have people
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actually create passwords for our study.
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So we used a service called Amazon Mechanical Turk,
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and this is a service where you can post
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a small job online that takes a minute,
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a few minutes, an hour,
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and pay people, a penny, ten cents, a few dollars,
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to do a task for you,
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and then you pay them through Amazon.com.
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So we paid people about 50 cents
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to create a password following our rules
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and answering a survey,
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and then we paid them again to come back
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two days later and log in
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using their password and answering another survey.
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So we did this, and we collected 5,000 passwords,
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and we gave people a bunch of different policies
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to create passwords with.
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So some people had a pretty easy policy,
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we call it Basic8,
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and here the only rule was that your password
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had to have at least eight characters.
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Then some people had a much harder policy,
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and this was very similar to the CMU policy,
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that it had to have eight characters
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including uppercase, lowercase, digit, symbol,
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and pass a dictionary check.
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And one of the other policies we tried,
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and there were a whole bunch more,
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but one of the ones we tried was called Basic16,
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and the only requirement here
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was that your password had to have at least 16 characters.
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All right, so now we had 5,000 passwords,
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and so we had much more detailed information.
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Again we see that there's only a small number
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of symbols that people are actually using
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in their passwords.
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We also wanted to get an idea of how strong
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the passwords were that people were creating,
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but as you may recall, there isn't a good measure
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of password strength.
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So what we decided to do was to see
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how long it would take to crack these passwords
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using the best cracking tools
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that the bad guys are using,
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or that we could find information about
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in the research literature.
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So to give you an idea of how bad guys
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go about cracking passwords,
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they will steal a password file
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that will have all of the passwords
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in kind of a scrambled form, called a hash,
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and so what they'll do is they'll make a guess
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as to what a password is,
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run it through a hashing function,
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and see whether it matches
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the passwords they have on their stolen password list.
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So a dumb attacker will try every password in order.
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They'll start with AAAAA and move on to AAAAB,
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and this is going to take a really long time
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before they get any passwords
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that people are really likely to actually have.
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A smart attacker, on the other hand,
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does something much more clever.
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They look at the passwords
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that are known to be popular
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from these stolen password sets,
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and they guess those first.
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So they're going to start by guessing "password,"
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and then they'll guess "I love you," and "monkey,"
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and "12345678,"
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because these are the passwords
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that are most likely for people to have.
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In fact, some of you probably have these passwords.
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So what we found
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by running all of these 5,000 passwords we collected
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through these tests to see how strong they were,
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we found that the long passwords
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were actually pretty strong,
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and the complex passwords were pretty strong too.
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However, when we looked at the survey data,
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we saw that people were really frustrated
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by the very complex passwords,
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and the long passwords were a lot more usable,
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and in some cases, they were actually
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even stronger than the complex passwords.
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So this suggests that,
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instead of telling people that they need
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to put all these symbols and numbers
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and crazy things into their passwords,
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we might be better off just telling people
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to have long passwords.
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Now here's the problem, though:
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Some people had long passwords
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that actually weren't very strong.
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You can make long passwords
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that are still the sort of thing
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that an attacker could easily guess.
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So we need to do more than just say long passwords.
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There has to be some additional requirements,
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and some of our ongoing research is looking at
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what additional requirements we should add
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to make for stronger passwords
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that also are going to be easy for people
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to remember and type.
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Another approach to getting people to have
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stronger passwords is to use a password meter.
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Here are some examples.
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You may have seen these on the Internet
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when you were creating passwords.
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We decided to do a study to find out
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whether these password meters actually work.
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Do they actually help people
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have stronger passwords,
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and if so, which ones are better?
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So we tested password meters that were
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different sizes, shapes, colors,
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different words next to them,
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and we even tested one that was a dancing bunny.
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As you type a better password,
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the bunny dances faster and faster.
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So this was pretty fun.
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What we found
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was that password meters do work.
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(Laughter)
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Most of the password meters were actually effective,
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and the dancing bunny was very effective too,
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but the password meters that were the most effective
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were the ones that made you work harder
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before they gave you that thumbs up and said
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you were doing a good job,
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and in fact we found that most
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of the password meters on the Internet today
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are too soft.
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They tell you you're doing a good job too early,
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and if they would just wait a little bit
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before giving you that positive feedback,
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you probably would have better passwords.
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Now another approach to better passwords, perhaps,
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is to use pass phrases instead of passwords.
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So this was an xkcd cartoon from a couple of years ago,
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and the cartoonist suggests
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that we should all use pass phrases,
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and if you look at the second row of this cartoon,
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you can see the cartoonist is suggesting
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that the pass phrase "correct horse battery staple"
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would be a very strong pass phrase
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and something really easy to remember.
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He says, in fact, you've already remembered it.
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And so we decided to do a research study
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to find out whether this was true or not.
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In fact, everybody who I talk to,
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who I mention I'm doing password research,
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they point out this cartoon.
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"Oh, have you seen it? That xkcd.
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Correct horse battery staple."
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So we did the research study to see
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what would actually happen.
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So in our study, we used Mechanical Turk again,
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and we had the computer pick the random words
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in the pass phrase.
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Now the reason we did this
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is that humans are not very good
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at picking random words.
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If we asked a human to do it,
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they would pick things that were not very random.
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So we tried a few different conditions.
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In one condition, the computer picked
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from a dictionary of the very common words
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in the English language,
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and so you'd get pass phrases like
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"try there three come."
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And we looked at that, and we said,
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"Well, that doesn't really seem very memorable."
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So then we tried picking words
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that came from specific parts of speech,
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so how about noun-verb-adjective-noun.
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That comes up with something that's sort of sentence-like.
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So you can get a pass phrase like
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"plan builds sure power"
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11:53
or "end determines red drug."
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11:55
And these seemed a little bit more memorable,
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11:58
and maybe people would like those a little bit better.
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12:01
We wanted to compare them with passwords,
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12:03
and so we had the computer pick random passwords,
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12:07
and these were nice and short, but as you can see,
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1990
12:09
they don't really look very memorable.
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12:11
And then we decided to try something called
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12:13
a pronounceable password.
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12:14
So here the computer picks random syllables
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12:17
and puts them together
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12:18
so you have something sort of pronounceable,
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12:20
like "tufritvi" and "vadasabi."
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740842
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12:23
That one kind of rolls off your tongue.
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12:25
So these were random passwords that were
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12:27
generated by our computer.
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2744
12:30
So what we found in this study was that, surprisingly,
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12:33
pass phrases were not actually all that good.
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12:37
People were not really better at remembering
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12:40
the pass phrases than these random passwords,
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12:43
and because the pass phrases are longer,
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12:45
they took longer to type
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1226
12:47
and people made more errors while typing them in.
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12:50
So it's not really a clear win for pass phrases.
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12:53
Sorry, all of you xkcd fans.
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12:56
On the other hand, we did find
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12:58
that pronounceable passwords
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1804
13:00
worked surprisingly well,
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13:01
and so we actually are doing some more research
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13:04
to see if we can make that approach work even better.
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13:07
So one of the problems
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13:09
with some of the studies that we've done
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13:10
is that because they're all done
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13:12
using Mechanical Turk,
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13:14
these are not people's real passwords.
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13:15
They're the passwords that they created
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13:18
or the computer created for them for our study.
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13:20
And we wanted to know whether people
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13:22
would actually behave the same way
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13:24
with their real passwords.
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13:26
So we talked to the information security office at Carnegie Mellon
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13:30
and asked them if we could have everybody's real passwords.
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3803
13:34
Not surprisingly, they were a little bit reluctant
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13:35
to share them with us,
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1550
13:37
but we were actually able to work out
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13:39
a system with them
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13:40
where they put all of the real passwords
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13:42
for 25,000 CMU students, faculty and staff,
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3091
13:45
into a locked computer in a locked room,
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13:47
not connected to the Internet,
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13:49
and they ran code on it that we wrote
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13:51
to analyze these passwords.
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13:53
They audited our code.
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13:54
They ran the code.
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1312
13:55
And so we never actually saw
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13:57
anybody's password.
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2817
14:00
We got some interesting results,
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14:02
and those of you Tepper students in the back
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14:03
will be very interested in this.
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14:06
So we found that the passwords created
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3731
14:10
by people affiliated with the school of computer science
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14:12
were actually 1.8 times stronger
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14:14
than those affiliated with the business school.
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14:18
We have lots of other really interesting
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14:20
demographic information as well.
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14:22
The other interesting thing that we found
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14:24
is that when we compared the Carnegie Mellon passwords
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14:27
to the Mechanical Turk-generated passwords,
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14:29
there was actually a lot of similarities,
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2619
14:31
and so this helped validate our research method
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14:33
and show that actually, collecting passwords
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14:36
using these Mechanical Turk studies
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14:38
is actually a valid way to study passwords.
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14:41
So that was good news.
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14:43
Okay, I want to close by talking about
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14:45
some insights I gained while on sabbatical
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14:47
last year in the Carnegie Mellon art school.
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14:51
One of the things that I did
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14:52
is I made a number of quilts,
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1524
14:53
and I made this quilt here.
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14:55
It's called "Security Blanket."
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14:57
(Laughter)
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2431
14:59
And this quilt has the 1,000
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3095
15:02
most frequent passwords stolen
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2328
15:05
from the RockYou website.
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2571
15:07
And the size of the passwords is proportional
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2061
15:09
to how frequently they appeared
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15:11
in the stolen dataset.
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15:13
And what I did is I created this word cloud,
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2632
15:16
and I went through all 1,000 words,
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2132
15:18
and I categorized them into
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15:20
loose thematic categories.
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920456
2380
15:22
And it was, in some cases,
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1903
15:24
it was kind of difficult to figure out
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924739
2038
15:26
what category they should be in,
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926777
1755
15:28
and then I color-coded them.
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1899
15:30
So here are some examples of the difficulty.
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2619
15:33
So "justin."
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1181
15:34
Is that the name of the user,
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934231
1829
15:36
their boyfriend, their son?
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936060
1322
15:37
Maybe they're a Justin Bieber fan.
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937382
2888
15:40
Or "princess."
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2225
15:42
Is that a nickname?
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1635
15:44
Are they Disney princess fans?
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1595
15:45
Or maybe that's the name of their cat.
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945725
3694
15:49
"Iloveyou" appears many times
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949419
1655
15:51
in many different languages.
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951074
1545
15:52
There's a lot of love in these passwords.
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952619
3735
15:56
If you look carefully, you'll see there's also
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956354
1680
15:58
some profanity,
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958034
2267
16:00
but it was really interesting to me to see
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960301
1950
16:02
that there's a lot more love than hate
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962251
2307
16:04
in these passwords.
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2292
16:06
And there are animals,
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966850
1490
16:08
a lot of animals,
423
968340
1360
16:09
and "monkey" is the most common animal
424
969700
2304
16:12
and the 14th most popular password overall.
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972004
3675
16:15
And this was really curious to me,
426
975679
2231
16:17
and I wondered, "Why are monkeys so popular?"
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2523
16:20
And so in our last password study,
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980433
3352
16:23
any time we detected somebody
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983785
1686
16:25
creating a password with the word "monkey" in it,
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985471
2649
16:28
we asked them why they had a monkey in their password.
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3030
16:31
And what we found out --
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1910
16:33
we found 17 people so far, I think,
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993060
2103
16:35
who have the word "monkey" --
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995163
1283
16:36
We found out about a third of them said
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996446
1812
16:38
they have a pet named "monkey"
436
998258
1740
16:39
or a friend whose nickname is "monkey,"
437
999998
2291
16:42
and about a third of them said
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1660
16:43
that they just like monkeys
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1533
16:45
and monkeys are really cute.
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1005482
1638
16:47
And that guy is really cute.
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1007120
3639
16:50
So it seems that at the end of the day,
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3408
16:54
when we make passwords,
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1783
16:55
we either make something that's really easy
444
1015950
1974
16:57
to type, a common pattern,
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3009
17:00
or things that remind us of the word password
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2486
17:03
or the account that we've created the password for,
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3312
17:06
or whatever.
448
1026731
2617
17:09
Or we think about things that make us happy,
449
1029348
2642
17:11
and we create our password
450
1031990
1304
17:13
based on things that make us happy.
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2238
17:15
And while this makes typing
452
1035532
2863
17:18
and remembering your password more fun,
453
1038395
2870
17:21
it also makes it a lot easier
454
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1807
17:23
to guess your password.
455
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1506
17:24
So I know a lot of these TED Talks
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1748
17:26
are inspirational
457
1046326
1634
17:27
and they make you think about nice, happy things,
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2461
17:30
but when you're creating your password,
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1897
17:32
try to think about something else.
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1052318
1991
17:34
Thank you.
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1107
17:35
(Applause)
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553
About this website

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