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Conditional access system

  • US 5,796,829 A
  • Filed: 06/24/1996
  • Issued: 08/18/1998
  • Est. Priority Date: 09/09/1994
  • Status: Expired due to Fees
First Claim
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1. An access control processor for a conditional access system in which encrusted information segments provided by a plurality of information service providers are encrypted for transmission in accordance with different conditional access processes respectively utilizing different algorithms for encrypting the information segments, the processor comprisinga decryptor in an information receiver for decrypting encrypted information segments received by the information receiver by processing the received encrypted information segments with a session key used for encrypting the information segments in accordance with an algorithm utilized in one of said conditional access processes;

  • anda conditional access controller in the information receiver for selectively enabling the decryptor to decrypt received information segments encrypted in accordance with any of said different conditional access processes by providing to the decryptor cryptographic information for defining the algorithm utilized in said one of said different conditional access processes for use by the decryptor to decrypt the received information segment encrypted in accordance with said algorithm.

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