Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2011-08-30
2011-08-30
Tran, Ellen (Department: 2433)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
Reexamination Certificate
active
08010794
ABSTRACT:
In a system comprising a broadcasting subsystem and a radiocommunication subsystem each connected to a mediation platform, said transmission being ciphered and arranged for being deciphered by using a key, the following steps are performed at the mediation platform, relatively to a user or group of users having terminals: determining one first and at least one second sets of values from said key, so that the knowledge of all the determined sets of values is required to retrieve the key; and controlling the broadcasting subsystem so that it transmits the first set of values to the user or group of users and the radiocommunication subsystem so that it transmits the at least one second set of values to the user or group of users.
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European Broadcasting Union, ETSI EN 302 304 V1.1.1 (Nov. 2004), European Standard (Telecommunications series), “Digital Video Broadcasting (DVB); Transmission System for Handheld Terminals (DVB-H),” pp. 1-14 (2004).
European Search Report, pp. 1-3, Feb. 22, 2006.
Barnes & Thornburg LLP
Nortel Networks Limited
Tran Ellen
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