Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2004-04-06
2009-02-10
Zand, Kambiz (Department: 2134)
Cryptography
Video cryptography
Video electric signal modification
C380S037000, C380S201000, C380S202000, C380S210000, C726S027000, C705S051000, C725S023000, C725S031000
Reexamination Certificate
active
07489780
ABSTRACT:
A semiconductor integrated circuit for the processing of conditional access television signals comprises an input interface for receiving encrypted television signals and an output interface for output of decrypted television signals. Control signals broadcast with the television signals include control words and common keys. Entitlement messages are received in encrypted form, encrypted according to a secret key unique to each semiconductor integrated circuit. The input interface is connected to a decryption circuit whereby the only manner of providing the common keys to the circuit are in encrypted form encrypted according to the secret key. Due to the monolithic nature of the circuit, no secrets are exposed and the system is secure. Alternatively, the entitlement messages are encrypted for decryption with the common keys and a unique ID stored in the circuit is compared with an ID in a received entitlement message. Only if the received and stored IDs match can the rights be stored and used.
REFERENCES:
patent: 4613901 (1986-09-01), Gilhousen et al.
patent: 4816654 (1989-03-01), Anderl et al.
patent: 5018197 (1991-05-01), Jones et al.
patent: 5282249 (1994-01-01), Cohen et al.
patent: 5852290 (1998-12-01), Chaney
patent: 5953418 (1999-09-01), Bock et al.
patent: 6157719 (2000-12-01), Wasilewski et al.
patent: 6219422 (2001-04-01), Sato
patent: WO 00/59222 (2000-10-01), None
patent: WO 01/74071 (2001-10-01), None
Buer, M., et al., “Integrated Security for Digital Video Broadcast,”IEEE Transactions on Consumer Electronics 42(3):500-503, Aug. 1996.
EBU Project Group B/CA, “Functional Model of a Conditional Access System,”EBU Technical Review, No. 266, pp. 64-77, Winter 1995.
Cordero Rodgrigo
Dellow Andrew
Jorgenson Lisa K.
Ringer Eric M.
Seed IP Law Group PLLC
STMicroelectronics Limited
Tran Tongoc
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