Security device and head end in conditional access system...

Details Security device and head end in conditional access system... Security device and head end in conditional access system...

2006-04-11

2010-10-05

Moazzami, Nasser (Department: 2436)

Interactive video distribution systems

Access control or blocking

With encryption or scrambling of video signal

C380S210000, C725S143000

Reexamination Certificate

active

07810113

ABSTRACT:
A security device and a head end of a conditional access system (CAS), and a method for controlling illegal use of the conditional access system, capable of minimizing the number of entitlement management messages (EMMs) to be distributed from a head end to a user are provided. Update keys encrypted with user keys and channel management keys encrypted with the update keys are utilized.

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patent: 2004/0181800 (2004-09-01), Rakib et al.
patent: 2006/0098822 (2006-05-01), Markey
patent: 2009/0106850 (2009-04-01), Robert et al.
patent: 2009/0150673 (2009-06-01), DeFreese et al.
Morris et al. “Interactive TV Standards”, May 5, 2005, Focal Press, 4 pages.
Dodis et al. “A Generic Construction for Intrustion Resilient Public Key Encryption”, 2004, pp. 81-98.

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