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Method for establishing a cryptographic key, network front end and receiver therefor and method for transmitting signal

A receiver, network technology, applied in the field of transmission signals

Inactive Publication Date: 2013-04-17
威尔塞斯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem of how to perform the authentication step during the creation of the session key when the receiver does not have any security processor or secret several authentication information

Method used

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  • Method for establishing a cryptographic key, network front end and receiver therefor and method for transmitting signal
  • Method for establishing a cryptographic key, network front end and receiver therefor and method for transmitting signal
  • Method for establishing a cryptographic key, network front end and receiver therefor and method for transmitting signal

Examples

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Embodiment Construction

[0056] figure 1 A system 2 is shown for transmitting a scrambled multimedia signal from a network headend 4 to a plurality of receivers over a two-way communication network 8 .

[0057] In the remainder of this description, features and functions of the system 2 that are well known to those skilled in the art will not be described in detail.

[0058] Furthermore, to simplify figure 1 , only one receiver 10 is depicted.

[0059] The multimedia signal is for example an audiovisual program or a pay TV channel.

[0060] Receiver 10 is capable of decoding and descrambling received multimedia signals, thereby producing decoded and descrambled audiovisual signals that can be displayed by display device 12 . Device 12 is in this example a television. The device 12 is directly connected to the receiver 10, eg by a wired connection.

[0061] The receiver 10 specifically includes:

[0062] The descrambler 14 is capable of descrambling the scrambled multimedia signal through the che...

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PUM

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Abstract

This method of establishing a cryptographic session key comprises: a subscription phase (104) during which an identifier of a local loop to the end of which a receiver must be connected is acquired, and an authentication step comprising: a) an operation (142) of automatically obtaining an identifier of the local loop to the end of which the receiver is actually connected, and b) an operation (146) of verifying that the identifier obtained during the operation a) corresponds to the identifier acquired during the subscription phase so as to authenticate the receiver.

Description

technical field [0001] The invention relates to a method of creating a key, a network head and a receiver for the method, and a method of transmitting signals. Background technique [0002] There are various methods of creating a session key that is common to both the network head-end transmitting the scrambled multimedia signals and the receivers of those scrambled multimedia signals. The receiver is usually able to descramble the received scrambled multimedia signal by means of the check word. [0003] The network head and the receiver are connected to each other by a communication network, wherein, among all the local loops, each local loop constituting the last part of each subscriber line is uniquely identified by a local loop identifier. A receiver can be connected to the end of any of those local loops. The local loops are directly connected on one side to the termination site of the network at the network subscriber's residence, and on the other side to a telephone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/266H04N21/64H04N21/643H04N7/16
CPCH04N21/26613H04L63/061H04N7/165H04N21/64322H04N21/64H04N21/472H04N21/6334H04L12/22H04L9/00
Inventor P·卡莱斯
Owner 威尔塞斯