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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. Rich Felker‏ @RichFelker 18 Oct 2016

      Rich Felker Retweeted the grugq

      @CopperheadOS can you confirm?https://twitter.com/thegrugq/status/788467139741003777 …

      Rich Felker added,

      the grugq @thegrugq
      Android N "File Based Encryption" has basically removed "encryption at rest" completely from the system. It is a complete fucking shitshow.
      1 reply 0 retweets 2 likes
    2. CopperheadOS‏ @CopperheadOS 18 Oct 2016
      Replying to @RichFelker

      It never had encryption when locked. Can't really do that with dm-crypt since it's all or nothing. It became feasible with this.

      1 reply 0 retweets 0 likes
    3. CopperheadOS‏ @CopperheadOS 18 Oct 2016
      Replying to @CopperheadOS @RichFelker

      There's the keystore, which is based on lock state. So it's possible to have data that's encrypted at rest but it's a pain.

      1 reply 0 retweets 0 likes
    4. CopperheadOS‏ @CopperheadOS 18 Oct 2016
      Replying to @CopperheadOS @RichFelker

      Now that they're using ext4 encryption, they adopted per-user encryption. They haven't implemented actually logging out though.

      2 replies 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS 18 Oct 2016
      Replying to @CopperheadOS @RichFelker

      Consider something like a messaging app. In general, it needs access to data after first unlock so it can provide notifications.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 18 Oct 2016
      Replying to @CopperheadOS

      Only if you want notifications while locked. I nuke all that stuff from orbit with notification-blocking/background-killing.

      1:14 PM - 18 Oct 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS 18 Oct 2016
          Replying to @RichFelker

          Or if you want to support alternate unlock methods like the fingerprint scanner without them being an encryption weak link...

          1 reply 0 retweets 0 likes
        3. CopperheadOS‏ @CopperheadOS 18 Oct 2016
          Replying to @CopperheadOS @RichFelker

          Android's keystore is protected at rest. Enabling fingerprint unlock has to open up an easier route to making it available.

          1 reply 0 retweets 0 likes
        4. CopperheadOS‏ @CopperheadOS 18 Oct 2016
          Replying to @CopperheadOS @RichFelker

          It's possible to leverage the keystore for at-rest encryption. The weak point is the lack of convenient APIs to do any of this.

          1 reply 0 retweets 0 likes
        5. CopperheadOS‏ @CopperheadOS 18 Oct 2016
          Replying to @CopperheadOS @RichFelker

          It'd be nice if multi-user killed keys, but they had to start somewhere. At least there isn't a single encryption key anymore.

          0 replies 0 retweets 0 likes
        6. End of conversation

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