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
colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

Tweets

Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
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. Colin Percival‏ @cperciva 2 Nov 2018
      • Report Tweet
      • Report NetzDG Violation

      I've been getting a few questions about the recent "PortSmash" vulnerability announcement. Short answer: This is not something you need to worry about. If your code is vulnerable to it, you were already vulnerable to other (easier) attacks.

      1 reply 38 retweets 57 likes
      Show this thread
    2. Colin Percival‏ @cperciva 2 Nov 2018
      • Report Tweet
      • Report NetzDG Violation

      While it's great to see that someone put together exploit code for this, it's not a new discovery: I described this attack in 2005 when I first exposed the dangers of shared resources in Intel Hyperthreading.

      1 reply 2 retweets 13 likes
      Show this thread
    3. Colin Percival‏ @cperciva 2 Nov 2018
      • Report Tweet
      • Report NetzDG Violation

      I didn't write exploit code at the time because this attack only works when the sequence of instructions bring executed depends on sensitive information; and if that's the case you're already leaking information in many other ways (code cache, data cache, branch prediction...).

      1 reply 0 retweets 8 likes
      Show this thread
    4. Colin Percival‏ @cperciva 2 Nov 2018
      • Report Tweet
      • Report NetzDG Violation

      The defence against PortSmash is exactly the same as the defence against microarchitectural side channel attacks from 2005: Make sure that the cryptographic key you're using does not affect the sequence of instructions or memory accesses performed by your code.

      2 replies 1 retweet 11 likes
      Show this thread
      Colm MacCárthaigh‏ @colmmacc 2 Nov 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @cperciva

      Not just the key, the secret data too! This is the right advice, but it's very unsatisfying. It's still too hard to write and verify this kind of code, and sometimes coding mistakes there are bigger problems than the side channels they were designed to fix.

      11:50 AM - 2 Nov 2018
      • 1 Like
      • Deirdre Connolly¹
      1 reply 0 retweets 1 like
        1. New conversation
        2. Colin Percival‏ @cperciva 2 Nov 2018
          • Report Tweet
          • Report NetzDG Violation
          Replying to @colmmacc

          Keys are generally more sensitive than data; but yes, it should all be kept secure. I've been asking compiler authors for 13 years to give us better tools, e.g. to mark variables as "cannot be used in control flow or address computation". Alas, no progress yet...

          2 replies 1 retweet 2 likes
        3. Colin Percival‏ @cperciva 2 Nov 2018
          • Report Tweet
          • Report NetzDG Violation
          Replying to @cperciva @colmmacc

          Maybe Amazon can find some smart compiler people and get them to do this? It would help everybody's security. ;-)

          1 reply 0 retweets 0 likes
        4. 2 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