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. Matthew Hardeman‏ @mdhardeman 22 Aug 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @SwiftOnSecurity and

      It's true for regulated industries, but maybe it's time for that split. Token Binding allows for U2F tokens to be part of handshake and kills off MITM for 2FA auth, even with a good cert... But... Some industries have regulatory requirements to capture user generated content.

      2 replies 0 retweets 0 likes
    2. Tavis Ormandy‏Verified account @taviso 22 Aug 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @mdhardeman @SwiftOnSecurity and

      I think you're saying that it will break TLS MITM middleware boxes (like bluecoat). True, but for those to work you already need Administrator access to endpoint (to install CA). If you have Admin, you can just hook and patch browser instead, which is worse!

      2 replies 0 retweets 3 likes
    3. Tavis Ormandy‏Verified account @taviso 22 Aug 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @mdhardeman and

      So I'm saying, it doesn't make TLS MITM untenable, it forces the vendors hand to do dangerous things. Do you want more security vendors patching around in chrome.exe? If we could prevent Administrators from MitMing endpoints, you better believe I would be hassling chrome devs 🤣

      3 replies 0 retweets 2 likes
    4. Matthew Hardeman‏ @mdhardeman 22 Aug 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @SwiftOnSecurity and

      The usual tricks of the sort could be used on (normal retail Chrome to make patching untenable and force those who really need MITM to weigh & absorb the costs of running a Bluecoat maintained Chromium. Reinforces difference for end-user.

      2 replies 0 retweets 0 likes
    5. Tavis Ormandy‏Verified account @taviso 22 Aug 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @mdhardeman @SwiftOnSecurity and

      There are no "usual tricks" that make patching untenable to Administrators, if there were, we would do that. This is one of those "immutable laws of computer security".

      1 reply 0 retweets 1 like
    6. Matthew Hardeman‏ @mdhardeman 22 Aug 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @SwiftOnSecurity and

      That's not entirely true. It's draconian, but all sorts of DRM techniques exist for this stuff. It doesn't have to be perfect. It just has to make it painful enough and change often enough that Bluecoat, etc. can't keep up. See PC gaming...

      1 reply 0 retweets 1 like
    7. Matthew Hardeman‏ @mdhardeman 22 Aug 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @SwiftOnSecurity and

      I think the difference is in controlling the brand and by doing so allowing the end-user to discern a visible difference. "This is real Chrome and when I'm in this, it's not cooperating with the boss spying." "This is the work browser that I have to use so that they see."

      1 reply 0 retweets 1 like
    8. Rich Felker‏ @RichFelker 22 Aug 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @mdhardeman @taviso and

      Yes exactly. That kind of UX distinction is essential to teaching non-security-expert users basic safety AND to building their faith that TLS/HTTPS/encryption actually does what it's claimed to do.

      2 replies 0 retweets 2 likes
      Tavis Ormandy‏Verified account @taviso 22 Aug 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @RichFelker @mdhardeman and

      Everyone thinks that, the problem is it's not possible. Why don't you just solve the halting problem Rich, that would make things much easier. Don't you care about users? Do the right thing, stop tweeting and get solving.

      1:08 PM - 22 Aug 2018
      • 3 Likes
      • mitchel lewis Michael Hay Katie Moussouris
      1 reply 0 retweets 3 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 22 Aug 2018
          • Report Tweet
          • Report NetzDG Violation
          Replying to @taviso @mdhardeman and

          Here "not possible" is a matter of political will/marketplace influence by the browser vendors, not some underlying fundamental impossibility. Tweeting about it is a small step towards making the idea that they should do this mainstream.

          1 reply 0 retweets 1 like
        3. Tavis Ormandy‏Verified account @taviso 22 Aug 2018
          • Report Tweet
          • Report NetzDG Violation
          Replying to @RichFelker @mdhardeman and

          Write me a program that can safely assert something when the Administrator is malicious, it can be as simple as you like. Make it show the result of X509_verify() or something in a message box.

          1 reply 0 retweets 1 like
        4. 15 more replies

      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