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Set top box encryption program descrambling method and set top box

A set-top box and encryption technology, applied in the field of communications, can solve the problem of unscrambled programs that cannot be BISS encrypted

Inactive Publication Date: 2014-07-16
SHENZHEN JIUZHOU ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, it is necessary to provide a set-top box encrypted program descrambling method for the problem that the above-mentioned advanced security set-top box cannot descramble the BISS encrypted program

Method used

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  • Set top box encryption program descrambling method and set top box
  • Set top box encryption program descrambling method and set top box

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] figure 1 It is a flowchart of a method for descrambling an encrypted program in a set-top box in an embodiment. The method includes:

[0035] S10: For the program to be played, analyze and obtain the encryption method of the program.

[0036] In this method, instead of directly descrambling the program to be played, the encryption method of the program is firstly analyzed to know which decryption method is adopted by the program. In this embodiment, this step is specifically: query the PMT table (program mapping table) in the frequency point where the program is located, analyze the condi...

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PUM

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Abstract

The invention relates to a set top box encryption program descrambling method and a set top box. The method includes the following steps that for a playing program, an encryption mode of the program is analyzed and acquired; whether the encryption mode of the program is a BISS encryption mode or not is judged, if yes, the descrambling mode of the set top box is set as an non-advanced security descrambling mode, and then BISS descrambling is conducted, and if not, the descrambling mode of the set top box is set as an advanced security descrambling mode. By the adoption of the set top box encryption program descrambling method and the set top box, the corresponding descrambling modes are set according to the different encryption modes, on the premise that security is guaranteed, audience can watch the BISS encrypted program and can watch more television programs without being limited by encryption modes, and therefore great convenience and good experience are brought to users.

Description

technical field [0001] The invention relates to the communication field, in particular to a set-top box encrypted program descrambling method and the set-top box. Background technique [0002] BISS, the full name of Basic Interoperable Scrambling System, is a scrambling method used in digital TV systems. It is a satellite broadcast encryption system and a scrambling method with fixed keys. Some programs are encrypted using BISS encryption. [0003] At present, in order to ensure security, most set-top boxes are advanced security set-top boxes. In the advanced security set-top box, the conditional access (CA) key is transmitted in cipher text, and only in the main chip is plain text, and the set-top box with the advanced security mode for descrambling directly sets the plain text key to the decryption scrambler, the program cannot be descrambled. However, the BISS encryption method is plain text, which causes the high-level security set-top box to be unable to descramble th...

Claims

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Application Information

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IPC IPC(8): H04N21/4623H04N21/435
Inventor 郑巧红
Owner SHENZHEN JIUZHOU ELECTRIC
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