Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
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
Liu Zong Wei
Shao Ling
Xie Dong
Zhang Jian
Herzberg Louis P.
International Business Machines - Corporation
Peeso Thomas R.
Yamonaco Lisa M.
LandOfFree
Key distribution in a conditional access system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Key distribution in a conditional access system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Key distribution in a conditional access system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3830749