The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 2013
Filed:
Sep. 24, 2007
Wolfgang Bücker, Neubiberg, DE;
Günther Horn, München, DE;
Srinath Thiruvengadam, Donauwörth, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
Cryptographic material is generated for a protocol for the encrypted transmission of media data between a subscriber device and a provider device. A first symmetric key of the subscriber device and the provider device is inserted in a symmetric key protection mechanism of a network protocol of a control layer to establish a communication session between the subscriber device and the provider device. A first time-variable parameter is transmitted from the provider device to the subscriber device. A second symmetric key for protecting the key management protocol is calculated by both the provider device and the subscriber device using a defined function depending at least on the first symmetric key and the first time-variable parameter.