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