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.
  • Home Home Home, current page.
  • Moments Moments Moments, current page.

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
dguido's profile
Dan Guido
Dan Guido
Dan Guido
@dguido

Tweets

Dan Guido

@dguido

CEO @trailofbits, organizer @EmpireHacking, director @hack_secure. Open DMs.

Brooklyn, NY
trailofbits.com
Joined April 2008

Tweets

  • © 2018 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • 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. Dan Guido‏ @dguido 21 Mar 2016

      If you're struggling to understand the impact of today's iMessage flaw, remember that it requires either a Root CA or Apple's help to work.

      3 replies 27 retweets 15 likes
      Dan Guido‏ @dguido 21 Mar 2016

      If you consider an attacker with a Root CA, then attacks on iMessage are the last thing you have to worry about.

      3:00 PM - 21 Mar 2016
      • 26 Retweets
      • 18 Likes
      • Camilo Rodríguez Christopher ✨ Vinny Zombini (U̶n̶affiliated to Lizard People)✨ Brian Morgan Carroll chris staines Ivan Grgec 🌈Wolkenmacher🤦‍♀️ Keith Maxon
      5 replies 26 retweets 18 likes
        1. Dan Guido‏ @dguido 21 Mar 2016
          Replying to @dguido

          I wrote some additional, brief comments on the iMessage flaw on HN. https://news.ycombinator.com/item?id=11332715 …

          0 replies 3 retweets 5 likes
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo
        1. New conversation
        2. Patrick Figel‏ @patfigel 21 Mar 2016
          Replying to @dguido

          @dguido Well, I don't know about that 😁 http://oalmanna.blogspot.co.at/2016/03/startssl-domain-validation.html …

          1 reply 0 retweets 1 like
        3. Dan Guido‏ @dguido 21 Mar 2016
          Replying to @patfigel

          @patfigel Yes, my point was access to a Root CA is catastrophic in many other ways before you think about decrypting iMessages with it.

          2 replies 0 retweets 0 likes
        4. Patrick Figel‏ @patfigel 21 Mar 2016
          Replying to @dguido

          @dguido Absolutely. Plus, in this case, cert pinning limits the attack surface to Apple/owned Apple servers, if I understood correctly.

          1 reply 0 retweets 0 likes
        5. Dan Guido‏ @dguido 21 Mar 2016
          Replying to @patfigel

          @patfigel Yes, cert pinning is a very strong immediate mitigation for this attack.

          0 replies 0 retweets 0 likes
        6. End of conversation
        1. New conversation
        2. Dominic White‏ @singe 21 Mar 2016
          Replying to @dguido

          @dguido @chriseng given you can just serve any cert & Apple will prompt the user to add it to RootCA list. That isn't so far off.

          1 reply 1 retweet 0 likes
        3. Runa Sandvik‏Verified account @runasand 21 Mar 2016
          Replying to @singe

          @singe @dguido @chriseng I'd also argue most users will have no idea they've installed such a cert.

          1 reply 1 retweet 1 like
        4. Dominic White‏ @singe 21 Mar 2016
          Replying to @runasand

          @runasand @dguido @chriseng yep. Works for iOS profiles too. Add a passwd for removal & one mistake & you've got them near permanently.

          1 reply 1 retweet 1 like
        5. 1 more reply
        1. Rob Popovic‏ @robertpopovic 1 Apr 2016
          Replying to @dguido

          @dguido how prevalent are root CA attacks becoming? any examples you've heard about in the wild?

          0 replies 0 retweets 0 likes
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo
        1. Dominic White‏ @singe 21 Mar 2016
          Replying to @dguido

          @dguido @chriseng if they have a passcode, they have to enter it, so not 0 interaction, but it's surprisingly little effort.

          0 replies 0 retweets 0 likes
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo

      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

        • © 2018 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Cookies
        • Ads info