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

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Colm MacCárthaigh

@colmmacc

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

Seattle
notesfromthesound.com
Joined April 2008

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    1. Peter Bowen‏ @pzb 23 Oct 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @colmmacc

      What is the allowable path for upstream data? Is there some reasonable realtime communication path from the cable box to the provider or does it all have to be unidirectional?

      1 reply 0 retweets 2 likes
    2. Colm MacCárthaigh‏ @colmmacc 23 Oct 2018
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      Replying to @pzb

      Like maybe I can log into a website or phone someone to subscribe, but there's no two way communication with the decoder itself. So just like real-world cable, satellite, or broadcast.

      1 reply 0 retweets 1 like
    3. Peter Bowen‏ @pzb 23 Oct 2018
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      Replying to @colmmacc

      Wikipedia says largest PPV says are about 6M per event. At this volume, wrapping a key to each decoder is reasonable, with the assumption each decoder has a known unique public key. Send keys over the unidirectional channel alongside the video data.

      1 reply 0 retweets 5 likes
    4. Colm MacCárthaigh‏ @colmmacc 23 Oct 2018
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      Replying to @pzb

      Which primitives would you use? How often would you rotate the DEK?

      1 reply 0 retweets 0 likes
    5. Peter Bowen‏ @pzb 23 Oct 2018
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      Replying to @colmmacc

      NaCl box seems sane here. DEK is the private key on the decoder?

      2 replies 0 retweets 2 likes
    6. Colm MacCárthaigh‏ @colmmacc 23 Oct 2018
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      Replying to @pzb

      Well, the DEK has to be shared across all subscribers .. but you want to rotate it so that you can cut-off non-payers/fraud-cases. So I think you envelope the DEK with a per-device KEK.

      1 reply 0 retweets 4 likes
    7. Peter Bowen‏ @pzb 23 Oct 2018
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      Replying to @colmmacc

      It depends on whether this is PPV or Satellite style? PPV is effectively single shot, so rotating DEK in the middle of the fight is likely overkill. Satellite is a different story -- go read up on DirecTV card hacking from the late 90s/early 2000s.

      0 replies 0 retweets 6 likes
      Colm MacCárthaigh‏ @colmmacc 23 Oct 2018
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      Replying to @BRIAN_____ @pzb

      ♥️that insight - it’d be super valuable to build in a UX that displays what you’re subscribed to from the decoder’s POV and for that to involve an e2e check.

      6:38 PM - 23 Oct 2018 from Seattle, WA
      0 replies 0 retweets 0 likes

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