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