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tehjh's profile
Jann Horn
Jann Horn
Jann Horn
@tehjh

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Jann Horn

@tehjh

works at Google Project Zero. personal account.

Joined August 2011

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    1. Dan Kaminsky‏Verified account @dakami 8 Jul 2017
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      Replying to @bahstgwamt @kragen and

      Constant time crypto is mostly math nerds showing off. Determine the worst case time for an algorithm and spin for that amount.

      1 reply 0 retweets 3 likes
    2. You and 52 others‏ @bahstgwamt 8 Jul 2017
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      Replying to @dakami @solardiz @matthew_d_green

      we already had this discussion. I agreed with you, people with actual experience explained why we were wrong

      2 replies 0 retweets 3 likes
    3. Dan Kaminsky‏Verified account @dakami 8 Jul 2017
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      Replying to @bahstgwamt @kragen and

      *shrugs* Yeah, I've seen their threat models. Yeah, sure, not what we're defending against.

      1 reply 0 retweets 1 like
    4. Solar Designer‏ @solardiz 8 Jul 2017
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      Replying to @dakami @kragen @matthew_d_green

      I only vaguely recall that discussion, but IIRC IMO the threat models were fine and you were wrong. But we need s/constant time/timing-safe/

      1 reply 0 retweets 4 likes
    5. Solar Designer‏ @solardiz 8 Jul 2017
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      Replying to @solardiz @dakami and

      Realistically & under relevant threat models, we can't have & don't need constant time; we need time & resource usage independent of secrets

      4 replies 2 retweets 15 likes
    6. Dan Kaminsky‏Verified account @dakami 8 Jul 2017
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      Replying to @solardiz @kragen @matthew_d_green

      Yeah, that's basically what I was arguing, constant time math is one of several ways to achieve secret independent timing and it's harder.

      1 reply 0 retweets 2 likes
    7. Solar Designer‏ @solardiz 8 Jul 2017
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      Replying to @dakami @kragen @matthew_d_green

      IIRC, you were arguing for spinning until worst case time, and that's secret-dependent resource usage, so it's susceptible to side-channels

      3 replies 0 retweets 6 likes
    8. Dan Kaminsky‏Verified account @dakami 8 Jul 2017
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      Replying to @solardiz @kragen @matthew_d_green

      Spin, keep adding and multiplying, whatever. I don't actually see code as a path to TEMPEST security. You need to know your attackers data.

      2 replies 1 retweet 1 like
    9. Dan Kaminsky‏Verified account @dakami 8 Jul 2017
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      Replying to @dakami @solardiz and

      Time and exposed computational power can be survived. RF side channels, electrical side channels, fundamentally unbound and insecurable.

      1 reply 0 retweets 3 likes
    10. Dan Kaminsky‏Verified account @dakami 8 Jul 2017
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      Replying to @dakami @solardiz and

      Even constant time math is useless against a sufficiently intrusive electrical probe.

      3 replies 0 retweets 1 like
      Jann Horn‏ @tehjh 8 Jul 2017
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      Replying to @dakami @solardiz and

      it sounds like you see two attack classes: remote (timing-only) and physical. but there are other cases, like unprivileged bad software

      2:28 PM - 8 Jul 2017
      2 replies 0 retweets 0 likes
        1. Dan Kaminsky‏Verified account @dakami 8 Jul 2017
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          Replying to @tehjh @solardiz and

          I have a whole taxonomy around this. A lot of reduced privilege environments are at best, best effort.

          0 replies 0 retweets 0 likes
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