Patent ID: 6108422
Filing Date: 2000-08-22
Classification: H04N

Abstract:
An access control processor for a conditional access system in which an encrypted information segment provided by an information service provider is encrypted for transmission in accordance with a conditional access process utilizing an algorithm for encrypting the information segment, 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 the algorithm utilized in said conditional access process; anda conditional access controller in the information receiver for enabling the decryptor to decrypt received information segments encrypted in accordance with said conditional access process by providing to the decryptor cryptographic information for defining the algorithm utilized in said conditional access process for use by the decryptor to decrypt the received information segments encrypted in accordance with said algorithm, wherein the conditional access controller includesmeans for detecting within an information stream received by the information receiver cryptographic information for defining the algorithm used for encrypting information segments in accordance with said conditional access process; andmeans for downloading the detected cryptographic information from said information stream.