Method for securing system protected by a key hierarchy
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United States of America Patent
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Apr 24, 2001
Grant Date -
N/A
app pub date -
Dec 15, 1997
filing date -
Nov 28, 1996
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for securing a system protected by a predefined hierarchy of cryptographic keys, and in particular, for securing a pay TV system, against unauthorized users. An individual cryptographic key assigned to a dishonest customer is determined by forming the intersection of at least two predefined subsets formed at different points in time and pertaining to the same hierarchical level.
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