Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.

This is the legacy version of twitter.com. We will be shutting it down on June 1, 2020. Please switch to a supported browser, or disable the extension which masks your browser. You can see a list of supported browsers in our Help Center.

  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
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

  • © 2020 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Imprint
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. Leif Ryge‏ @wiretapped May 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @wiretapped @taviso and

      also, for organizations who do have sufficient resources (i.e. companies like your employer) it gives them the opportunity to make it much more difficult for a bad actor to compromise their own builds (even for internal and/or proprietary builds, potentially)

      1 reply 0 retweets 0 likes
    2. Tavis Ormandy‏Verified account @taviso May 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @wiretapped @RichFelker and

      Yes, your proposal is that we need more more infrastructure to maintain, more access to audit, and more attack surface for real attacks that actually happen to defend against attacks that don't seem to happen. Do you understand why I think it's not a strong argument?

      1 reply 0 retweets 0 likes
    3. Leif Ryge‏ @wiretapped May 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @RichFelker and

      for closed-source, i agree there's a tradeoff between ensuring build integrity and ensuring source secrecy. for the rest of the world, the only downside is that it is some work; i think it's worth it to eliminate SPOFs and am glad when @ReproBuilds et al receive funding to do it!

      1 reply 0 retweets 0 likes
    4. Tavis Ormandy‏Verified account @taviso May 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @wiretapped @RichFelker and

      Huh, that's the first time I've seen a pro-repro person acknowledge literally any flaw in it. Let me ask you this, do you agree that you can eliminate the same SPOFs *today*? I understand the benefits of repro builds, do you understand the problems?

      2 replies 0 retweets 0 likes
    5. Leif Ryge‏ @wiretapped May 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @RichFelker and

      you're saying you can eliminate the SPOF by building software oneself, but i assume you aren't saying it would be practical for everyone to actually do this. i'm saying repro builds enable everyone's phones and laptops to stop relying on build SPOFs in a way that is practical.

      1 reply 0 retweets 0 likes
    6. Tavis Ormandy‏Verified account @taviso May 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @wiretapped @RichFelker and

      You don't have to build it yourself, you can choose someone you trust to build it. That is required in your system too, how do you imagine users will verify the build can be reproduced? They nominate a trusted party to check.

      1 reply 0 retweets 1 like
    7. Leif Ryge‏ @wiretapped May 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @RichFelker and

      Leif Ryge Retweeted Leif Ryge

      The user doesn't need to pick "a" (singular) party; they can pick several independent parties and require build signatures from m of n of them. (But their software update mechanism should come pre-configured to trust several, so actually they do nothing.)https://twitter.com/wiretapped/status/1265028062074241027 …

      Leif Ryge added,

      Leif Ryge @wiretapped
      Replying to @taviso @dEnergy_dTime and 9 others
      what if i don't know who to trust, so i want a version n people have signed off on instead of accepting Matthew as my SPOF?
      2 replies 0 retweets 2 likes
    8. Tavis Ormandy‏Verified account @taviso May 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @wiretapped @RichFelker and

      How will they trust the software update mechanism?

      1 reply 0 retweets 0 likes
    9. Tavis Ormandy‏Verified account @taviso May 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @wiretapped and

      Is the answer that they will need to pick "a" (singular) party?

      1 reply 0 retweets 0 likes
    10. Leif Ryge‏ @wiretapped May 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @RichFelker and

      that is another orthogonal problem, but say it came preinstalled on their computer. yes, they are trusting one party at the beginning; reproducible builds do not solve the need to trust your hardware. but with repro they can be protected from that party's subsequent compromise.

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso May 26
      • Report Tweet
      • Report NetzDG Violation
      Replying to @wiretapped @RichFelker and

      Yes, every problem inconvenient to your argument is "orthogonal". You need to pick a (singular) vendor you trust. We've already established that vendor can produce trusted builds from source code. Why do you need reproducible builds?

      1:20 PM - 26 May 2020
      • 1 Like
      • Shakeel Mahate
      1 reply 0 retweets 1 like
        1. New conversation
        2. Leif Ryge‏ @wiretapped May 26
          • Report Tweet
          • Report NetzDG Violation
          Replying to @taviso @RichFelker and

          The need to trust that a singular vendor is honest-at-the-moment-you-get-the-computer does not mean that you also must rely on them (or any other SPOFs in your software supply chain) continuing to be honest after that point.

          2 replies 0 retweets 1 like
        3. Tavis Ormandy‏Verified account @taviso May 26
          • Report Tweet
          • Report NetzDG Violation
          Replying to @wiretapped @RichFelker and

          **Yes it does** In your system, end-users can't reproduce builds themselves - somebody has to do it for them. This has to be true, because if they can verify themselves, then they don't need reproducible builds.

          0 replies 0 retweets 0 likes
        4. End of conversation

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2020 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Imprint
        • Cookies
        • Ads info