CN101931784B - By the method for HDCP double secret key encrypting and decrypting recorded program - Google Patents
By the method for HDCP double secret key encrypting and decrypting recorded program Download PDFInfo
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- CN101931784B CN101931784B CN201010241433.8A CN201010241433A CN101931784B CN 101931784 B CN101931784 B CN 101931784B CN 201010241433 A CN201010241433 A CN 201010241433A CN 101931784 B CN101931784 B CN 101931784B
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Abstract
The invention discloses a kind of method that digital television program recorded by HDCP double secret key carries out encryption and decryption.The method by utilize HDMI with HDCP double secret key recorded content carry out encryption and decryption computing, and in the computing of encryption and decryption, add equipment Serial Number (KSV), due to the uniqueness of the KSV sequence number that television set or Set Top Box are carried, achieve the encryption and decryption to recorded content, the digital program recorded by digital television or top box of digital machine can only be play in the machine.
Description
Technical field
The present invention relates to the broadcasting of digital television program, particularly a kind of digital television program recorded by HDCP double secret key carries out the method for encryption and decryption.
Background technology
Along with the development of Digital Television, television operator is proposed a series of charging TV program, and user just has permission viewing after must handling relevant payment procedure.The recording of Most current digital television program does not all encrypt restriction, and the digital television program recorded at a television set or Set Top Box can play with on a series of product.Therefore, a payment user recorded program can be supplied to other user's viewings of not paying the fees, and not by the restriction of television operator.This way makes the interests of digital program operator can not get ensureing.
Summary of the invention
A kind of digital television program recorded by HDCP double secret key is the object of the present invention is to provide to carry out the method for encryption and decryption.
Deciphering two parts when the encryption when method that the digital television program recorded by HDCP double secret key that the present invention proposes carries out encryption and decryption comprises program recording and broadcast program, concrete steps are as follows:
Record encryption during digital program:
Step S1: when digital television program recording, ciphering unit is from the sequence number (KSV) of readout equipment the device storing HDCP key;
Step S2: in the process of program recording, computing is encrypted to digital television program (TS stream), add KSV content in this cryptographic calculation, generate containing the HDCP key K ey1 of KSV content and the encrypt file A of digital television program (TS stream).
Play decryption processing during program recording:
Step S3: when playing digital television program, decryption unit reads the embedded HDCP cipher key content Key1 of encrypt file A;
Step S4: read the HDCP key K ey2 that the machine carries from playback equipment HDCP key storage device;
Step S4: comparison Key1 and Key2, if Key1 with Key2 is consistent, from encrypt file A, reduce the digital television program (TS stream) that comprises playing; If Key1 and Key2 is inconsistent, display inactive file also returns.
The invention provides a kind of method that digital program recorded by HDCP double secret key carries out encryption and decryption, achieve the machine and record the object only can play in the machine, be conducive to protecting the intellectual property and the interests of operator.
Accompanying drawing explanation
Fig. 1 is the flow chart that the present invention is encrypted;
Fig. 2 is the flow chart that the present invention is decrypted.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.
In recent years, there is a kind of HDCP technology HDCP (High-bandwidth Digital Content Protection).The appearance of HDCP ensure that the high definition signal that HDMI (High-Definition Multimedia Interface) or DVI (Digital Visual Interface) transmits can not illegally be recorded.HDCP technical specification completes by Intel Company is leading, and when user carries out bootlegging, this technology can be disturbed, and reduces the quality of the image copying out, thus protects content.The principle of HDCP is, an available key collection is all stored at transmitting terminal and receiving terminal, these keys are all secure stores, transmitting terminal and receiving terminal are all encrypted decrypt operation according to key, can be added some be worth KSV especially in such computing, the cryptography processing units of transmitting terminal and receiving terminal checks the KSV value of the other side, to guarantee the legitimacy connected.
Existing most of digital television and digital TV set-top box are all with recording function and HDMI, if arrange HDCP key in HDMI, this HDCP key has uniqueness, just can protect recorded program.
The present invention by utilize HDMI with HDCP double secret key recorded content carry out encryption and decryption computing, and in the computing of encryption and decryption, add a special value calculate video-encryption key.This special value selects equipment Serial Number (KSV), due to the uniqueness of the KSV sequence number that television set or Set Top Box are carried, achieve the encryption and decryption to recorded content, the digital program recorded by digital television or top box of digital machine can only be play in the machine.
Based on above-mentioned principle, the deciphering two parts when encryption when method that the digital television program recorded by HDCP double secret key that the present invention proposes carries out encryption and decryption comprises program recording and broadcast program, concrete steps are as follows:
Encryption (recording digital program):
Step S1: when digital television program recording, ciphering unit is from the sequence number (KSV) of readout equipment the device storing HDCP key;
Step S2: in the process of program recording, computing is encrypted to digital television program (TS stream), and add in this cryptographic calculation containing KSV content, generate containing the HDCP key K ey1 of KSV content and the encrypt file A of digital television program (TS stream).
Deciphering (broadcasting recorded content):
Step S3: when playing digital television program, decryption unit reads the embedded HDCP cipher key content Key1 of encrypt file A;
Step S4: read the HDCP key K ey2 that the machine carries from playback equipment HDCP key storage device;
Step S4: comparison Key1 and Key2, if Key1 with Key2 is consistent, from encrypt file A, reduce the digital television program (TS stream) that comprises playing; If Key1 and Key2 is inconsistent, display inactive file also returns.
Claims (1)
1. the digital television program recorded by HDCP double secret key carries out a method for encryption and decryption, it is characterized in that comprising the following steps:
Record encryption during digital program:
Step S1: when digital television program recording, ciphering unit is from the sequence number of readout equipment the device storing HDCP key;
Step S2: be encrypted computing to digital television program in the process of program recording, adds KSV content in this cryptographic calculation, generate containing the HDCP key K ey1 of KSV content and the encrypt file A of digital television program;
Play decryption processing during program recording:
Step S3: when playing digital television program, decryption unit reads the embedded HDCP cipher key content Key1 of encrypt file A;
Step S4: read the HDCP key K ey2 that the machine carries from playback equipment HDCP key storage device;
Step S4: comparison Key1 and Key2, if Key1 with Key2 is consistent, from encrypt file A, reduce the digital television program comprised playing; If Key1 and Key2 is inconsistent, display inactive file also returns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010241433.8A CN101931784B (en) | 2010-07-30 | 2010-07-30 | By the method for HDCP double secret key encrypting and decrypting recorded program |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010241433.8A CN101931784B (en) | 2010-07-30 | 2010-07-30 | By the method for HDCP double secret key encrypting and decrypting recorded program |
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| Publication Number | Publication Date |
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| CN101931784A CN101931784A (en) | 2010-12-29 |
| CN101931784B true CN101931784B (en) | 2015-07-29 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102831352B (en) * | 2012-09-11 | 2015-02-18 | 南京天溯自动化控制系统有限公司 | Equipment authorization use method and equipment for method |
| CN103065068B (en) * | 2012-12-19 | 2015-12-23 | 深圳创维－Rgb电子有限公司 | A kind of encryption method of imprinting file and device |
| CN103200442B (en) * | 2013-04-07 | 2016-06-15 | 四川长虹电器股份有限公司 | Set Top Box is utilized to control the method that high-definition program is play |
| CN107431832B (en) * | 2015-03-13 | 2020-08-18 | 美国莱迪思半导体公司 | Maintaining synchronization of encryption processes across devices by sending frame numbers |
| CN105245348A (en) * | 2015-10-21 | 2016-01-13 | 广州视源电子科技股份有限公司 | Factory detection method, device and system for HDCP function |
| CN106229007B (en) * | 2016-08-09 | 2019-11-05 | 广州视源电子科技股份有限公司 | HDCP KEY sending method, burning method and device |
| CN109286837A (en) * | 2018-10-10 | 2019-01-29 | 四川长虹电器股份有限公司 | The system and method for programme replay is recorded in a kind of control |
| CN110062294B (en) * | 2019-04-24 | 2021-10-19 | 晶晨半导体(上海)股份有限公司 | HDCP (high-level data protection protocol) key-based signal transmission method and system |
| CN111405366B (en) * | 2020-03-09 | 2022-09-16 | 深圳创维－Rgb电子有限公司 | Key file synthesis method and device and computer readable storage medium |
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| CN1710955A (en) * | 2004-06-18 | 2005-12-21 | 罗姆股份有限公司 | Apparatus key protection method, enciphering and deciphering apparatus and video transmitting receiving apparatus |
| CN1937759A (en) * | 2005-10-31 | 2007-03-28 | 康佳集团股份有限公司 | In-hand key ditial television signal encryption system |
| CN101521818A (en) * | 2009-04-08 | 2009-09-02 | 四川长虹电器股份有限公司 | Encryption and decryption system based on medium security protection of IPTV platform |
| CN101715634A (en) * | 2007-03-22 | 2010-05-26 | 高通股份有限公司 | System and method for implementing content protection in a wireless digital system |
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2010
- 2010-07-30 CN CN201010241433.8A patent/CN101931784B/en active Active
Patent Citations (4)
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| CN1710955A (en) * | 2004-06-18 | 2005-12-21 | 罗姆股份有限公司 | Apparatus key protection method, enciphering and deciphering apparatus and video transmitting receiving apparatus |
| CN1937759A (en) * | 2005-10-31 | 2007-03-28 | 康佳集团股份有限公司 | In-hand key ditial television signal encryption system |
| CN101715634A (en) * | 2007-03-22 | 2010-05-26 | 高通股份有限公司 | System and method for implementing content protection in a wireless digital system |
| CN101521818A (en) * | 2009-04-08 | 2009-09-02 | 四川长虹电器股份有限公司 | Encryption and decryption system based on medium security protection of IPTV platform |
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| CN101931784A (en) | 2010-12-29 |
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