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

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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

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    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
      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.

      8:52 AM - 17 Apr 2018
      2 replies 0 retweets 0 likes
        1. New conversation
        2. 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
        3. 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
        4. 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
        5. 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
        6. CopperheadOS‏ @CopperheadOS Apr 17
          Replying to @CopperheadOS @RichFelker

          It works for both the stock OS and CopperheadOS. If there were other aftermarket operating systems that were fully signed with proper block-based updates and verified boot, they could also be added to our Auditor app and service. Users can built it to check for their key too.

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

          If you like remote attestation, fine, but I want it nowhere near me.

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

          No more Android phones, iPhones or any other phones with a TPM or comparable TEE for you then. Not sure what you think is bad about using these features for something good like our Auditor app / service. Not aware of anyone using the feature for DRM at this time anyway.

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

          If the software is not exposing access to it, presence of hardware that could be used for it doesn't really matter.

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

          Okay, to rephrase then, all Android phones, iPhones, Chromebooks and business laptops running Windows have this feature in hardware and expose it via the OS. It doesn't matter that you run LineageOS. They go out of their way to bundle even the userspace components for Widevine.

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

          General purpose hardware-based attestation with support for other operating systems is new for Android 8.0+ devices. Nearly every device had Widevine support since many years ago. The new attestation isn't any use for image/video/music DRM since Widevine was already there.

          0 replies 0 retweets 0 likes
        7. End of conversation

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