Signal encryption apparatus for generating common and distinct k

Details Signal encryption apparatus for generating common and distinct k Signal encryption apparatus for generating common and distinct k

1991-01-23

1992-05-19

Tarcza, Thomas H.

Cryptography

Key management

Having particular key generator

H04L 900

Patent

active

051154676

ABSTRACT:
Signal encryption apparatus is provided for generating a common key and a distinct key from the same common secret generating key. A generating key is combined with common parameter data to provide a common intermediate key. The common intermediate key is used to produce a common key. The generating key is also combined with distinct parameter data to provide a distinct intermediate key. The distinct intermediate key is used to produce a distinct key. The system has particular applicability to the provision of category and program keys for use in a satellite television scrambling system. The generating key is used to produce the same category key at all uplinks, and different program keys at each uplink.

REFERENCES:
patent: 4613901 (1986-09-01), Gilhousen et al.
patent: 5016276 (1991-05-01), Matumoto et al.

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