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
RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

Tweets

Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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. CopperheadOS‏ @CopperheadOS Apr 16

      https://www.reddit.com/r/Android/comments/8cb99a/android_verified_boot_remote_attestation/dxfnt4i/ … Good luck with that "unbreakable" DRM. How exactly do you stop someone from recording the screen? Widevine already provided hardware-enforced DRM without needing general purpose remote attestation usable for non-DRM purposes and other operating systems.

      3 replies 6 retweets 12 likes
    2. Rich Felker‏ @RichFelker Apr 17
      Replying to @CopperheadOS

      Screen recording is not useful except as a last resort. High effort, low quality result. Widevine is trivially-removable DRM (removable in sense that you get full-quality original data) for someone experienced in RE.

      2 replies 0 retweets 0 likes
    3. CopperheadOS‏ @CopperheadOS Apr 17
      Replying to @RichFelker

      Widevine has the same kind of hardware support for remote attestation as this. It just isn't usable for anything other than DRM.

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker Apr 17
      Replying to @CopperheadOS

      That's why devices with hardware attestation are actively harmful. Once they're near-universal, support for devices without it can be dropped.

      1 reply 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS Apr 17
      Replying to @RichFelker

      Support for hardware attestation is universal across iPhones, Android phones, Chromebooks and most business laptops (TPM). However, until Android 8.0+, there was only proper attestation support for DRM. Android 8.0+ provides a general purpose feature and it supports other OSes.

      1 reply 0 retweets 0 likes
    6. CopperheadOS‏ @CopperheadOS Apr 17
      Replying to @CopperheadOS @RichFelker

      We've spent months working on making the attestation feature usable for users to verify devices locally and now to pair devices with an account on our service so their integrity can be automatically monitored on a schedule. Not sure how exactly you think it's harmful to do that.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker Apr 17
      Replying to @CopperheadOS

      I don't. I think it's harmful that the device has the functionality to begin with.

      9:19 AM - 17 Apr 2018
      2 replies 0 retweets 0 likes
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS Apr 17
          Replying to @RichFelker

          It's *mandatory* for every device launched with Android 8.0+ to have the functionality, so every Android device is going to have it. Not just every Android-only device, but any device that wants to have optional support for Android / dual boot with it.

          2 replies 0 retweets 0 likes
        3. CopperheadOS‏ @CopperheadOS Apr 17
          Replying to @CopperheadOS @RichFelker

          Widevine was optional, but every vendor included it. This is a general purpose security feature that was carefully designed to not be identifying so it's mandatory. CopperheadOS won't support a device without these capabilities but everything is going to have support for it.

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. New conversation
        2. Rich Felker‏ @RichFelker Apr 17
          Replying to @RichFelker @CopperheadOS

          I also think it's harmful to promote hardware attestation as something users should want rather than as something they should fight against.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker Apr 17
          Replying to @RichFelker @CopperheadOS

          And by hardware attestation I mean the whole thing. I am not distinguishing the old limited-to-widevine-DRM stuff vs more general-purpose stuff.

          1 reply 0 retweets 0 likes
        4. CopperheadOS‏ @CopperheadOS Apr 17
          Replying to @RichFelker

          It's a very useful security feature and we're going to get a lot out of it with our app and service as we improve them. It's particularly useful for a business deploying a fleet of devices and wanting to meaningfully monitor identity, integrity and patch level after pairing.

          1 reply 0 retweets 0 likes
        5. Rich Felker‏ @RichFelker Apr 17
          Replying to @CopperheadOS

          I understand and really have no sympathy there. Enterprise concerns are not my interest and usually are antithetical to my interests in protecting individuals/public.

          1 reply 0 retweets 0 likes
        6. CopperheadOS‏ @CopperheadOS Apr 17
          Replying to @RichFelker

          Our Auditor app started with the use case of individuals: locally verifying the identity and integrity of a device. The service is currently oriented towards individuals too since it's primarily being made for individuals that have bought CopperheadOS devices.

          2 replies 0 retweets 0 likes
        7. CopperheadOS‏ @CopperheadOS Apr 17
          Replying to @CopperheadOS @RichFelker

          It will be available for people using the stock OS on their phone too, or small companies, but it's not going to be a good fit for enterprise use without taking a much different approach to the account system and user interface. In general though, the feature is a good fit there.

          0 replies 0 retweets 0 likes
        8. 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

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