Conditional access system for digital receivers

Cryptography – Key management – Key distribution

Reexamination Certificate

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Details

C380S286000, C380S200000, C380S201000, C713S193000, C726S026000

Reexamination Certificate

active

07664268

ABSTRACT:
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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