Skip to content
  • 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
matthew_d_green's profile
Matthew Green
Matthew Green
Matthew Green
Verified account
@matthew_d_green

Tweets

Matthew GreenVerified account

@matthew_d_green

I teach cryptography at Johns Hopkins. Screeching voice of the minority.

Baltimore, MD
blog.cryptographyengineering.com
Joined January 2010

Tweets

  • © 2022 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. Matthew Green‏Verified account @matthew_d_green 14 Feb 2018

      Matthew Green Retweeted Gabriel Lewis  🦆

      Abusing a security technology like 2FA by turning it into a marketing opportunity is pretty much the most short-term clever, long-term foolish thing Facebook could do.https://twitter.com/gabriel__lewis/status/963121814166630400 …

      Matthew Green added,

      Gabriel Lewis  🦆 @Gabriel__Lewis
      So I signed up for 2 factor auth on Facebook and they used it as an opportunity to spam me notifications. Then they posted my replies on my wall. 🤦‍♂️ pic.twitter.com/Fy44b07wNg
      Show this thread
      25 replies 474 retweets 757 likes
      Show this thread
    2. Matthew Green‏Verified account @matthew_d_green 14 Feb 2018

      I don’t like to tell @alexstamos what to do, because he’s better at his job than I am. But if I was him I would be furious.

      2 replies 7 retweets 98 likes
      Show this thread
    3. Matthew Green‏Verified account @matthew_d_green 14 Feb 2018

      It’s like Facebook does good security/privacy things until the moment people stop paying attention. Then they do enough bad stuff to last all year.

      2 replies 20 retweets 107 likes
      Show this thread
    4. Matthew Green‏Verified account @matthew_d_green 14 Feb 2018

      It’s much like me and carbs.

      1 reply 2 retweets 107 likes
      Show this thread
    5. Matthew Green‏Verified account @matthew_d_green 14 Feb 2018

      Yeah. Wow. The linked post is absolutely right.pic.twitter.com/dj5Bmkeq3i

      7 replies 27 retweets 131 likes
      Show this thread
      Matthew Green‏Verified account @matthew_d_green 14 Feb 2018

      A lot of people are suggesting the Facebook SMS spam is a bug. Bullshit. Someone at FB made a deliberate decision to “re-engage users” by spamming all those mobile phone numbers 2FA users had entered. No bug here at all.

      6:16 AM - 14 Feb 2018
      • 55 Retweets
      • 215 Likes
      • Tony Gentilcore Tom Lowenthal THEE Sweet Baby Cthulhu Brian Moelk Angél Allen Nemo Jason Parmar Srinivasan 🏙 nina rodham clinton
      12 replies 55 retweets 215 likes
        1. New conversation
        2. Matthew Green‏Verified account @matthew_d_green 14 Feb 2018

          The worst part is that FB’s spam SMS *look* exactly like real 2FA login attempts when your phone screen is locked. So when one arrives (every evening between 8-10pm) you *have* to check it.pic.twitter.com/rVGvHmsffF

          2 replies 14 retweets 47 likes
          Show this thread
        3. Matthew Green‏Verified account @matthew_d_green 14 Feb 2018

          This in turn drives decision fatigue for users, which can harm security across all of the accounts they use. “Oh, just more FB spam, I’ll ignore that.”

          1 reply 12 retweets 96 likes
          Show this thread
        4. End of conversation
        1. New conversation
        2. the grugq‏ @thegrugq_ebooks 14 Feb 2018
          Replying to @matthew_d_green

          I think callout culture is bullshit, I demand a recount!

          1 reply 0 retweets 2 likes
        3. Ryan Hickman‏ @RyanHickmam 14 Feb 2018
          Replying to @thegrugq_ebooks @matthew_d_green

          why sms 2FA anyways? that is SO not secure and that should already be known

          1 reply 0 retweets 0 likes
        4. Show replies
        1. New conversation
        2. Evil X‏ @Evil_X_ 14 Feb 2018
          Replying to @matthew_d_green

          That's one reason why I'm really not comfortable with SMS 2FA and really prefer hw-based or app-based ones.

          2 replies 0 retweets 7 likes
        3. Bob Geoghegan‏ @bobgeoghegan 14 Feb 2018
          Replying to @Evil_X_ @matthew_d_green

          I fear if Facebook provided a 2FA app it would not just do 2FA but also feed them personal info about users they would monetize.

          3 replies 0 retweets 4 likes
        4. Show replies
        1. Zoe Dolan  💜‏ @zjdolan 14 Feb 2018
          Replying to @matthew_d_green

          Hell hath no fury like a Facebook scorned.

          0 replies 0 retweets 1 like
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo
        1. Mathias‏ @matthegap 14 Feb 2018
          Replying to @matthew_d_green

          That's just one of the reasons why I would never ever give my phone number to Facebook. Luckily, you can have 2fa without it.

          0 replies 0 retweets 2 likes
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo
        1. Bob Geoghegan‏ @bobgeoghegan 14 Feb 2018
          Replying to @matthew_d_green

          The only reason FB has my mobile number is for 2FA. This hasn't happened to me yet, but thanks for the heads-up. Also recommend putting FB account on a dedicated email address.

          0 replies 0 retweets 5 likes
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo
        1. New conversation
        2. Gavin Sharp‏ @gavinsharp 14 Feb 2018
          Replying to @matthew_d_green

          Facebook had SMS-based posting before they had 2FA, so the decision wasn’t necessarily made in that order!

          1 reply 0 retweets 0 likes
        3. Matthew Green‏Verified account @matthew_d_green 14 Feb 2018
          Replying to @gavinsharp

          When people enter their number specifically because they want 2FA you can’t just say “yeah but we already had SMS posting so it’s ok if we spam that number.”

          2 replies 0 retweets 11 likes
        4. Show 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

        • © 2022 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Cookies
        • Ads info