Cryptography – Communication system using cryptography – Symmetric key cryptography
Reexamination Certificate
2005-08-31
2008-10-07
Vu, Kimyen (Department: 2136)
Cryptography
Communication system using cryptography
Symmetric key cryptography
C380S260000
Reexamination Certificate
active
07433473
ABSTRACT:
The aim of this invention is to propose a flexible solution to the risk represented by the interception of data by an unauthorized party during the transmission of said data between a broadcast center and a specialized decryption/decompression circuit such as is used in a Pay-TV decoder. This aim is achieved by a data transmission method involving a broadcast center or diffusion center, a management center and a multimedia unit, the latter comprising at least one unique key and a security module having a transport key.
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Search Report and Written Opinion for related International Application No. PCT/EP2005/054472.
Fischer Nicolas
Kudelski Andre
Nicolas Christophe
Cervetti David Garcia
Harness & Dickey & Pierce P.L.C.
NagraCard S.A.
Vu Kimyen
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