Dynamically shifting control word

Details Dynamically shifting control word Dynamically shifting control word

2008-07-08

2008-07-08

Moise, Emmanuel L (Department: 2137)

Cryptography

Video cryptography

C380S231000, C380S277000, C380S282000, C726S028000, C726S029000, C726S030000

Reexamination Certificate

active

10181992

ABSTRACT:
A method for generating a plurality of control words, each control word controlling access to an object. The method includes providing a control word packet (CWP), generating a first control word (CW) from the CWP, providing a second CW generation input and producing a second CW based, at least in part, on both of the following the first CW and the second CW generation input. Control word generating apparatus for generating a plurality of control words is also disclosed.

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