System for providing keys

Details System for providing keys System for providing keys

2005-12-27

2005-12-27

Morse, Gregory (Department: 2134)

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

C380S207000

Reexamination Certificate

active

06980650

ABSTRACT:
A method for providing keys for descrambling scrambled content, the scrambled content being divided into frames, the method including: identifying a plurality of frames to be descrambled; for each frame of the plurality of frames, identifying a key period associated with a key for descrambling the frame; and for at least one frame f of the plurality of frames, substituting a substitute frame g for the frame f, the substitute frame g being chosen in order to reduce a total number of key periods associated with keys for descrambling all of the plurality of frames. Related apparatus and methods are also provided.

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H. Schulzrinne, A. Rao, R. Lanphier, “Real Time Streaming Protocol (RTSP)” (MMUSIC WG, Columbia U/Netscape/Real Networks, Feb. 2, 1998).
European Telecommunications Standards Institute, “Digital Video Broadcasting (DVB); Support for use of scrambling and Conditional Access (CA) within digital broadcasting systems” (ETSI Technical Report 289, Oct. 1996).
International Standard, “Information technology—Generic coding of moving pictures and associated audio information: Video” (ISO/IEC 13818-2, Second edition, Dec. 15, 2000).

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