Information security – Prevention of unauthorized use of data including prevention...
Reexamination Certificate
2002-11-01
2011-12-20
Moazzami, Nasser (Department: 2437)
Information security
Prevention of unauthorized use of data including prevention...
C380S277000, C380S278000
Reexamination Certificate
active
08082588
ABSTRACT:
The objective of the present invention is a storage method in a decoder of an event encrypted by control words that guarantees the access to this event at whichever moment, even if certain keys of the system have changed for security reasons. This objective is achieved by a storage method of an event encrypted by control words in a reception and decryption unit connected to a security unit, said control words and the necessary rights being contained in management messages encrypted by system keys, comprising storing the encrypted event as well as the control messages in the storage unit, and storing in the storage unit the system keys encrypted by a predefined local key stored in the security unit.
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Bertholet Patrick
Le Buhan Corine
Sasselli Marco
DLA Piper (LLP) US
Moazzami Nasser
Nagravision S.A.
Teslovich Tamara
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