Method and devices for encoding and decoding media data

Abstract

The invention relates to methods for encoding and decoding media data (MD, CMD). One of the methods comprises the following steps: A request is transmitted by a subscriber terminal (1) over a control network (2) to a control server (3) to establish a set of encoding parameters (K) for control data. The request includes identification data (ID) of the subscriber terminal (1). The control server (3) thereupon specifies the set of encoding parameters (K) for control data, comprising a random number (R), a control data key (CK) and an integrity key (IK), wherein the control data key (CK) and the integrity key (IK) are dependent on the random number (R) and the identification data (ID). A media key (MK) dependent on the control data key (CK) and on the integrity key (IK) is then generated by the control server (3) and transmitted over a core network (4) to a media server (5). The media key (MK) is used to encode and decode the media data (MD, CMD) subsequently transmitted over a media network (6). The invention also relates to a subscriber terminal (1), a control server (3), and a computer program product that are suitable for implementing the method.

Description

technical field [0001] The present invention relates to methods of encrypting and decrypting media data in a communication system. Furthermore, the invention relates to a subscriber device and a control server as part of a communication system as well as a computer program product by means of which the method can be carried out. Background technique [0002] With the widespread popularization of broadband mobile wireless networks, such as Universal Mobile Telecommunications System (UMTS: Universal Mobile Telecommunications System), the so-called Third Generation Partnership Project (3GPP: Third Generation Partnership Project) has developed a series of IP multimedia sub- System (IMS: IP-Multimediasubsystem) standard for integrating voice services and Internet services. The IMS standard will promote the integration of packet switching and circuit switching networks, especially in the field of mobile communications. However, IMS systems are also suitable for transmitting medi...

AI Technical Summary

Problems solved by technology

However, data transmission according to the SRTP standard cannot be used in particular in mixed networks, because technical problems sometimes arise when converting encrypted data streams at network boundaries, for example during transmission from the Internet to the public telephone network

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