Unlock instant, AI-driven research and patent intelligence for your innovation.

Digital television receiving control method and apparatus based on bi-directional network

A digital TV and control word technology, applied in two-way working systems, analog security/charging systems, etc., can solve problems such as slow encryption and decryption speed, different security, and no protected content key structure

Active Publication Date: 2009-08-05
BEIJING NOVEL SUPER DIGITAL TV TECH
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the symmetric encryption algorithm has the characteristics of simple encryption processing and fast encryption and decryption speed; the asymmetric encryption algorithm has the characteristics of slow encryption and decryption speed.
[0007] 3. Different security: Since the algorithm of the symmetric cryptographic algorithm is public, its security depends on the length of the block and the length of the password. Commonly used attack methods include: exhaustive password search method, dictionary attack, table lookup attack, differential cipher analysis, linear cryptanalysis, etc.
[0008] In the process of realizing the present invention, the inventor found that at present, the widely used key architecture for protecting the safe distribution of content in the field of digital television is aimed at the one-way network live broadcast scenario. The security is not as good as the asymmetric algorithm; on the other hand, there is no widely used key structure to protect the secure distribution of content for scenarios such as live broadcast, on-demand and download that appear on the two-way network

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Digital television receiving control method and apparatus based on bi-directional network
  • Digital television receiving control method and apparatus based on bi-directional network
  • Digital television receiving control method and apparatus based on bi-directional network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An embodiment of the present invention provides a two-way network-based digital TV viewing control method, which will be described in detail below in conjunction with the accompanying drawings.

[0026] figure 1 For the method flowchart of the embodiment of the present invention, please refer to figure 1 , the two-way network-based digital television viewing control method of the present embodiment mainly includes:

[0027] 101: Using the user's private key in the user's public-private key pair to decrypt the received viewing control key encrypted by the user's public key to obtain the viewing control key;

[0028] In this embodiment, the user's private key is a part of the user's public-private key pair. The user's public-private key pair can be obtained from a secure environment, for example, it can be obtained offline or online through a trusted third party. Wherein, how many public-private key pairs can be obtained offline? forms, such as card issuance or user ter...

Embodiment 2

[0086] An embodiment of the present invention also provides a safety device, which will be described in detail below with reference to the accompanying drawings.

[0087] Figure 8 It is a block diagram of the device composition of the embodiment of the present invention, please refer to Figure 8 , the safety device of this embodiment mainly includes:

[0088] The audience control key decryption unit 81 is used for utilizing the user private key in the user public-private key pair to decrypt the received audience control key encrypted by the user public key to obtain the audience control key;

[0089] The digital TV viewing control unit 82 is configured to use the viewing control key to control viewing of the received digital TV content ciphertext.

[0090] According to this embodiment, the safety device may also include:

[0091] The user's public-private key pair acquisition unit 83 is used to obtain the user's public-private key pair offline or online through a trusted ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a digital television reception control method and a device based on a bilateral network. The method comprises the following steps: a user private key of a user public and private key pair is utilized for decrypting a received reception control secret key which is encrypted by a user public key, thus obtaining the reception control secret key; and the reception control secret key is utilized for controlling the reception of the encrypted message of the received digital television content. By the method and the device of the embodiment of the invention, the problem of safe distribution of the protecting content on the digital television bidirectional network in live broadcasting, on-demand broadcasting and downloading and the problem of reception control are solved.

Description

technical field [0001] The invention relates to the field of digital television, in particular to a two-way network-based digital television viewing control method and device. Background technique [0002] In the field of digital TV, there are not only traditional digital TV based on one-way network, such as terrestrial digital TV, satellite digital TV, cable digital TV, etc., but also TV systems based on two-way network, such as mobile TV, IP TV, two-way cable TV, etc. Encryption of TV content is one of the essential links. [0003] The cryptographic algorithm includes symmetric cryptographic algorithm and asymmetric cryptographic algorithm. The so-called symmetric cryptographic algorithm means that the encryption key and decryption key of a cryptographic algorithm are the same, or although they are not the same, any one of them can easily deduce the other. , that is, the password is shared by both parties. An asymmetric cryptographic algorithm means that the encryption k...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04N7/173H04N7/16
Inventor 张晶刘达胡勇新王申
Owner BEIJING NOVEL SUPER DIGITAL TV TECH