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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

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Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

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    1. Lea Kissner‏ @LeaKissner May 22
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      Like I said when Zoom acquired Keybase: crypto is better with friends. The Keybase folks are amazing, as are @alexstamos and @matthew_d_green.

      1 reply 4 retweets 111 likes
      Show this thread
    2. Lea Kissner‏ @LeaKissner May 22
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      Also: please put your comments in the github because if we tried to use Twitter and HN as a project management tool it’s going to be excessively exciting.

      1 reply 4 retweets 70 likes
      Show this thread
    3. Lea Kissner‏ @LeaKissner May 22
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      Lea Kissner Retweeted Alex Stamos

      @alexstamos has a better list of Twitter handles (and thanks to all of the other folks who were involved, including the external counsel who suggested we use the phrase "as contemplated herein" multiple times and I almost did it)https://twitter.com/alexstamos/status/1263896949712814080 …

      Lea Kissner added,

      Alex StamosVerified account @alexstamos
      Zoom has published an initial design and roadmap for deploying end-to-end encryption for hundreds of millions of meeting participants. Check it out and leave your comments here: https://github.com/zoom/zoom-e2e-whitepaper/blob/master/zoom_e2e.pdf …
      Show this thread
      1 reply 0 retweets 34 likes
      Show this thread
    4. Deirdre Connolly¹‏ @durumcrustulum May 22
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      Replying to @LeaKissner @alexstamos

      Coming in hot with my q's about the web client 😎https://github.com/zoom/zoom-e2e-whitepaper/issues/2 …

      2 replies 0 retweets 10 likes
    5. Ryan Sleevi‏ @sleevi_ May 22
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      Replying to @durumcrustulum @LeaKissner @alexstamos

      https://www.chromestatus.com/feature/4913922408710144 …

      3 replies 0 retweets 9 likes
    6. Alex Stamos‏Verified account @alexstamos May 22
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      Replying to @sleevi_ @durumcrustulum @LeaKissner

      What’s the new hotness in protecting JS from being changed for one user?

      6 replies 0 retweets 5 likes
    7. Tavis Ormandy‏Verified account @taviso May 22
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      Replying to @alexstamos @sleevi_ and

      I'm not sure its a problem worth solving, you have to trust the provider, because bugdoors are perfect and plausibly deniable. If you distribute a targeted backdoor to one user, you might get caught, but w/bugdoor, just say "oops, please be responsible" if someone catches you.

      2 replies 0 retweets 7 likes
    8. Ryan Sleevi‏ @sleevi_ May 22
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      Replying to @taviso @alexstamos and

      Eh, and? That still means a big gap between web and native has been closed, at least in the handwavy, needs-to-be-specced thread I linked. Moves web from “always updating” to something more akin to defined instal/update points, which the provider can control and user audit

      1 reply 0 retweets 3 likes
    9. Tavis Ormandy‏Verified account @taviso May 22
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      Replying to @sleevi_ @alexstamos and

      and... what will the user be auditing for? That there are no backdoors, but might still be bugdoors? Is that really useful?

      1 reply 0 retweets 0 likes
    10. Ryan Sleevi‏ @sleevi_ May 22
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      Replying to @taviso @alexstamos and

      Considering the discussion was about web-vs-native, and this could make them equivalent in auditability, yes? I’m not arguing it gets you away from “trust the provider”, but it certainly gets you away from, say, having to trust me to police CAs in order to protect your updaters

      1 reply 0 retweets 1 like
      Tavis Ormandy‏Verified account @taviso May 22
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      Replying to @sleevi_ @alexstamos and

      Which specific characteristic is desirable, that we can check we got the same binary? I mean, I suppose that does mean less reliance on CA, it's far more common to have malicious or compromised provider?

      2:45 PM - 22 May 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Ryan Sleevi‏ @sleevi_ May 22
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          Replying to @taviso @alexstamos and

          Today’s Web model means attacker who pops provider or channel can serve arbitrary updates / code, including targeted to individual users. Native’s defense is to do codesigning/TUF so attacker has to compromise that key/source code. Web has **no** equivalent protection, not yet.

          2 replies 1 retweet 4 likes
        3. Tavis Ormandy‏Verified account @taviso May 22
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          Replying to @sleevi_ @alexstamos and

          Ah-ha, you're not concerned about a malicious provider, or provider ordered to insert a backdoor - only a compromised provider who is unwittingly serving a backdoor. I agree there's not parity there, although not sure native story is so great either!

          1 reply 0 retweets 3 likes
        4. 5 more replies

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