Method for securing a ciphered content transmitted by a...

Details Method for securing a ciphered content transmitted by a... Method for securing a ciphered content transmitted by a...

2004-04-23

2009-02-03

Heneghan, Matthew (Department: 2139)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Having particular address related cryptography

C380S281000

Reexamination Certificate

active

07487349

ABSTRACT:
A method is for protecting an encrypted content, by use of at least one encryption key. The method includes generation of a temporary encryption key, encryption by the temporary key of a value allowing the determination of the encryption keys of the content, transmission of the encrypted value to a multimedia unit, and encryption and transmission of at least two cryptograms including the temporary key encrypted by an authorization key. The first cryptogram is encrypted by a first authorization key pertaining to a first security module and the second cryptogram is encrypted by a second authorization key pertaining to a group of security modules whose first security module is excluded.

REFERENCES:
patent: 5592552 (1997-01-01), Fiat
patent: 5748736 (1998-05-01), Mittra
patent: 6035038 (2000-03-01), Campinos et al.
patent: 6049878 (2000-04-01), Caronni et al.
patent: 6263435 (2001-07-01), Dondeti et al.
patent: 6880081 (2005-04-01), Itkis
patent: 2002/0126847 (2002-09-01), Wajs et al.

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