A method for providing conditional access (i.e., managing access) to a received scrambled audio/visual (A/V) signal from a variety of sources by utilizing secret sharing for key recovery. Secret sharing eliminates the necessity to protect and transfer the complete descrambling keys between devices, because a portion of the key is stored in the device or a smart card coupled thereto.

 
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< Bit based arithmetic coding using variable size key cipher

> System and method of guaranteed anonymity of cable television viewership behavior

> Encrypting message for secure transmission

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