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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Transport key is encrypted via broadcast scheme. could use a tree of keys where each STB has different path of keys they don't know as a foundation. I know other schemes exist on IACR.
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