Apparatus and method for securing communication systems

Cryptography – Key management – Having particular key generator

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380 23, 380 25, 380 21, 380 44, 380 47, 380 49, H04L 914, H04L 926

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055902006

ABSTRACT:
A hacking prevention system and method wherein the descrambler receives a data stream including a series of authorization packets and a series of corresponding offset values. A random number is generated in the descrambler. Using this random number, a key is calculated, which corresponds to the authorization packet corresponding to the generated random number. This generated key and the offset value, which corresponds to the generated random number, are used to calculate the descrambling key.

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Wright, D. T., "Conditional Access Broadcasting: Datacare 2" BBC Research Dep't. Report No. 10 Aug., 1988, pp. 1-18.
Baylin, F., et al., World Satellite and Scrambling Methods. 2nd Edition, Bayline Publications 1991, pp. 243-244.
Satellite Watch News, Aug. 1991.

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