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

Tweets

Tavis OrmandyVerified account

@taviso

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

California
taviso.decsystem.org
Joined April 2008

Tweets

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    1. 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
    2. 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
    3. 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
    4. 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
    5. 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
    6. zooko‏ @zooko May 22
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      Replying to @taviso @alexstamos and

      Tavis, do you mean distributing the "targeted bugdoor" to all users but then only exercising it against the one target user? Or distributing it to just the targeted user?

      1 reply 0 retweets 0 likes
    7. Tavis Ormandy‏Verified account @taviso May 22
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      Replying to @zooko @alexstamos and

      Right, why not just distribute it to all users, and then exercise it against the target user? There is zero penalty if you're caught, you can just try again.

      1 reply 0 retweets 2 likes
    8. zooko‏ @zooko May 22
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      Replying to @taviso @alexstamos and

      hm. Interesting argument. So basically you have to always maintain at least one bugdoor in your release version.

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

      You can also add a new one in a feature update or patch if you decide to become malicious later, or if your old one gets found. I don't really know of any way to defend against bugdoors, you have to trust your provider. 🤷🏻‍♂️

      1 reply 0 retweets 3 likes
    10. zooko‏ @zooko May 22
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      Replying to @taviso @alexstamos and

      This argument also means there's no difference with regard to this between a local app and a web app, right?

      2 replies 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso May 22
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      Replying to @zooko @alexstamos and

      In terms of whether the crypto can be trusted? I don't think so. Ryan disagrees though, IIUC, he points out that if a compromised (but not malicious) vendor has separate code signing infrastructure, the attacker might not be able to get a modified build signed.

      4:07 PM - 22 May 2020
      • 3 Likes
      • Deirdre Connolly¹ Jack L.
      1 reply 0 retweets 3 likes
        1. New conversation
        2. Tavis Ormandy‏Verified account @taviso May 22
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          Replying to @taviso @zooko and

          If the vendor *is* trying to insert a backdoor, then there's no difference because of bugdoors.

          1 reply 0 retweets 2 likes
        3. zooko‏ @zooko May 22
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          Replying to @taviso @alexstamos and

          FWIW, I think it matters, the difference between a vendor being forced to commit to a permanent, public record versus not having to do so.

          1 reply 0 retweets 0 likes
        4. 4 more replies

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