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Key system for digital television broadcast condition receiving system

A technology of conditional access system and digital TV broadcasting, which is applied in the field of key system, can solve the problems that cannot adapt to the development of digital TV industry, etc., and achieve the effect of protecting security, resisting violent attacks, and improving security

Active Publication Date: 2012-12-12
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Problems solved by technology

[0005] In recent years, the rapid development of computer technology and digital technology has brought opportunities for the development of the digital TV industry. At the same time, the security of the digital TV system and the diversity of services have also put forward higher requirements for the conditional access system. The conditional access system of the three-layer key system gradually becomes unable to adapt to the development of the digital TV industry

Method used

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  • Key system for digital television broadcast condition receiving system
  • Key system for digital television broadcast condition receiving system

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Embodiment Construction

[0029] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0030] Such as figure 1 As shown, it is a structural block diagram of the key system of the present invention. The present invention provides a key system for a conditional access system of digital television broadcasting, which includes a five-layer key, and the five-layer key is a four-layer symmetric key And a layer of asymmetric key, the four-layer symmetric key includes control word CW (Control Word), service key SK (Service Key), distribution key DK (Distribution Key) and personal key PK (Personal Key ), the one-layer asymmetric key is an ECC key pair.

[0031] Wherein, the control word CW is used to scramble the program content, the service key SK is used to encrypt and protect the control word CW, the distribution key DK is used to encrypt and protect the service key SK, and the personal The key ...

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Abstract

The invention provides a key system for a digital television broadcast condition receiving system. The key system comprises five layers of keys, namely four layers of symmetrical keys and one layer of asymmetrical key, wherein the four layers of symmetrical keys comprises a control word (CW), a service key (SK), a distribution key (DK) and a personal key (PK); and the one layer of asymmetrical key is an error correction code (ECC) key pair. All the password algorithms which are used in the invention are designated by State Cryptography Administration and comply with the requirements in regulations on state commercial passwords. The intensity of the password algorithms is high, so that the brute force attacks based on a digital television broadcast network can be effectively resisted.

Description

technical field [0001] The invention relates to a key system, in particular to a key system used in a conditional access system for digital television broadcasting. Background technique [0002] In recent years, digital TV has become a focus of global high-tech industry competition. With the maturity of digital TV technology, many operators have begun to consider or start to build digital broadcast TV networks. Digital networks provide a wealth of value-added service opportunities and bring new development opportunities to the traditional broadcasting industry. The way out for the development of digital TV is to promote the development of TV through diversified charging methods, among which the conditional access (CA, conditiona laccess) system plays a very important role in the application platform of digital TV. [0003] The main working principle of the digital TV broadcasting conditional access system is: encrypt and transmit audio and video information and broadcast d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/6334H04L9/08
Inventor 郭宝安张飚于志强唐凌叶松丁瑶王杰斌吴渊鲁昱
Owner AEROSPACE INFORMATION
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