Security integrated circuit

Details Security integrated circuit Security integrated circuit

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.

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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.

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