Descrambling device

Details Descrambling device Descrambling device

1996-09-11

1998-10-20

Cain, David C.

Cryptography

Key management

Having particular key generator

380 10, H04L 900

Patent

active

058258884

ABSTRACT:
In a packet analyzing circuit, first and second key data are detected and stored in respective first and second key data registers. First and second key generation circuits generate first and second keys from the first and second key data. An exclusive OR operation is carried out to both keys so as to generate a scrambling key. Using the scrambling key as an initial value, a random number generator generates a PN code used for scrambling, so that scrambled data is descrambled by adding the PN code to the data. The first key generation circuit, which receives a control signal CON from a timing generation circuit, is controlled by the control signal CON such that a scrambling key is generated only when the random number generator needs an initial value.

REFERENCES:
patent: 4449247 (1984-05-01), Waschka et al.
patent: 4511919 (1985-04-01), Forgey et al.
"Technical Conditions for Data Broadcasting Using Satellite Broadcasting".

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