Key distribution in a conditional access system

Details Key distribution in a conditional access system Key distribution in a conditional access system

2007-11-13

2007-11-13

Peeso, Thomas R. (Department: 2132)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S164000, C713S165000, C713S166000

Reexamination Certificate

active

10667841

ABSTRACT:
Methods and apparatus for key distribution in a conditional access system, assuming that the set of all user nodes which the system can accommodate is a complete set, and a subset is composed of all user nodes or part of user nodes. One method comprises: decomposing said subset into at least one secondary subset; assigning a different user key to each secondary subset, each said user key being transmitted to all users in a corresponding secondary subset; encrypting an entitlement key by using each said user key so as to generate a cipher text corresponding to each said secondary subset; and combining said cipher text to generate a media key control block and transmitting said media key control block to all users in said subset. Since a classification method of a binary tree and a multiple tree is used, the invention can save a lot of network resources.

REFERENCES:
patent: 5394469 (1995-02-01), Nagel et al.
patent: 5483595 (1996-01-01), Owen
patent: 5504814 (1996-04-01), Miyahara
patent: 5568554 (1996-10-01), Eastlake, III

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