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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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    Colm MacCárthaigh‏ @colmmacc 23 Oct 2018
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    Cryptography people: using modern primitives, how would you build pay-per-view cable-tv style encryption? Assume a unidirectional and broadcast channel (everyone gets the same data, and can't send) because that's the hard part. Digital video though, not analog.

    5:56 PM - 23 Oct 2018
    • 10 Likes
    • Otto Max DeLiso Garrett Robinson Kieran Tully John Mileham Davor Khai Tran Deirdre Connolly¹
    12 replies 0 retweets 10 likes
      1. New conversation
      2. Peter Bowen‏ @pzb 23 Oct 2018
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        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
      3. 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
      4. 5 more replies
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      2. Jonathan M Henson‏ @JonathanMHenson 23 Oct 2018
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        Replying to @colmmacc

        When you pay over a tls channel, vend a one-time use key. Then use the key to decrypt the content as it’s streamed to you? The key can be global per event to save on the broadcaster’s end.

        1 reply 0 retweets 0 likes
      3. Colm MacCárthaigh‏ @colmmacc 23 Oct 2018
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        Replying to @JonathanMHenson

        How do you get the key to my decoder, and only the subscribed decoders? Only one-way comms to the decoder :)

        2 replies 0 retweets 1 like
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      1. Colm MacCárthaigh‏ @colmmacc 23 Oct 2018
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        Replying to @BRIAN_____ @pzb

        The unreliability is interesting ... like do we apply some kind of FEC on top of everything? Also, what kind of MACs are worth having? Should we let corrupt frames decrypt? Many video codecs can cope with corruption after all.

        0 replies 0 retweets 1 like
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      1. 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.

        0 replies 0 retweets 0 likes
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      1. New conversation
      2. Deirdre Connolly¹‏ @durumcrustulum 23 Oct 2018
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        Replying to @colmmacc

        Looking at the responses so far, I guess no one is concerned about encrypting 6 Million+ streams with unique keys live, no latency?

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

        Well, if it's say 100 bytes per envelope, including some metadata etc, that's 600MB ... so yeah it might take a while to send all of that.

        0 replies 0 retweets 1 like
      4. End of conversation
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      2. Jon Eaves‏ @joneaves 23 Oct 2018
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        Replying to @colmmacc

        What problem are we trying to solve? DRM? Subscription management? (I know you said PPV, but is that the only thing?) Is the view immediate, or can be delayed? Can I view it for 24 hrs or 1-shot?

        1 reply 0 retweets 0 likes
      3. Colm MacCárthaigh‏ @colmmacc 23 Oct 2018
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        Replying to @joneaves

        I don't have a real problem, I'm just making this up as a fun exercise. I suppose this is a kind of DRM. Let's say it's live video, like sports, for one shot, and it'd be neat to be able to subscribe to an event as late as possible.

        1 reply 0 retweets 1 like
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