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dguido's profile
Dan Guido
Dan Guido
Dan Guido
@dguido

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Dan Guido

@dguido

CEO @trailofbits, organizer @EmpireHacking, director @hack_secure. Open DMs.

Brooklyn, NY
trailofbits.com
Joined April 2008

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    2. Michael Koziarski‏ @nzkoz 21 Feb 2016
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      Replying to @msolnik

      @msolnik @dguido “The iteration count is calibrated so that one attempt takes approximately 80 milliseconds” https://www.apple.com/business/docs/iOS_Security_Guide.pdf …

      1 reply 0 retweets 0 likes
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    4. Michael Koziarski‏ @nzkoz 21 Feb 2016
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      Replying to @msolnik

      @msolnik @dguido the key for pbkdf2 is in the enclave, there’s no key read API, so I’m 99.999% sure it’s pure hardware cost of 80ms.

      2 replies 0 retweets 2 likes
    5. Dan Guido‏ @dguido 21 Feb 2016
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      Replying to @nzkoz

      @nzkoz @msolnik software can't lower the iteration count. Once you derive the key from a passcode, that's it, you have to deal.

      1 reply 0 retweets 0 likes
    6. Michael Koziarski‏ @nzkoz 21 Feb 2016
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      Replying to @dguido

      @dguido @msolnik could lower the iteration count for future passcodes set on the device. But ya doesn’t help here, just future brute forcers

      1 reply 1 retweet 1 like
    7. Dan Guido‏ @dguido 21 Feb 2016
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      Replying to @nzkoz

      @nzkoz @msolnik correct, but that's not the scenario we're talking about.

      1 reply 0 retweets 0 likes
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    10. Dan Guido‏ @dguido 21 Feb 2016
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      Replying to @msolnik

      @msolnik @nzkoz If PBKDF were benchmarked to 1s, it would take 2 years to break even a 5-char loweralphanum password

      1 reply 0 retweets 0 likes
      Dan Guido‏ @dguido 21 Feb 2016
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      @msolnik @nzkoz IMHO iteration count is the strongest first line of defense Apple has they can easily modify in a sw update.

      11:13 PM - 21 Feb 2016
      3 replies 0 retweets 0 likes
        1. New conversation
        1. ash‏ @uglypackets 21 Feb 2016
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          Replying to @dguido

          @dguido how does iteration count play with limitations in mobile compute power?

          1 reply 0 retweets 0 likes
        2. Dan Guido‏ @dguido 21 Feb 2016
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          Replying to @uglypackets

          @uglypackets users only enter their passwords infrequently, especially if they use TouchID. It's a UX issue, not a power issue.

          1 reply 0 retweets 0 likes
        3. 2 more replies
        1. Dan Guido‏ @dguido 21 Feb 2016
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          Replying to @dguido

          @msolnik @nzkoz Agree that hw changes required for stronger defenses down the line, like adding passcode delays to ROM in SEP.

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