Validity verification method for a local digital network key

Details Validity verification method for a local digital network key Validity verification method for a local digital network key

2003-08-14

2009-11-10

Moise, Emmanuel L (Department: 2437)

Cryptography

Video cryptography

Video electric signal modification

Reexamination Certificate

active

07616763

ABSTRACT:
The aim of this invention is to propose a control method for the conformity of a network key (NK). This method is applied during the transfer of data coming from a conditional access source to a domestic network. It handles on the verification of the network key (NK) authenticity using relevant control data provided by the verification center in general in form of a list {(TK)NK1, (TK)NK2, (TK)NK3. . . }.A verification of the presence or absence of a cryptogram (TK)NKis carried out according to the list {(TK)NK1, (TK)NK2, (TK)NK3. . . }. The cryptogram (TK)NKis constituted from a test key (TK), provided by the verification center, encrypted by a network key (NK) of a security module (CT) of a device (TV1, TV2, PC) connected to the network.

REFERENCES:
patent: 6038321 (2000-03-01), Torigai et al.
patent: 6925562 (2005-08-01), Gulcu et al.
patent: 7237108 (2007-06-01), Medvinsky et al.
patent: 1 079 628 (2001-02-01), None
patent: WO 00/56068 (2000-09-01), None
patent: WO 01/99422 (2001-12-01), None

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