CN101931784A - Method for encrypting and decrypting recorded program through HDCP key - Google Patents
Method for encrypting and decrypting recorded program through HDCP key Download PDFInfo
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- CN101931784A CN101931784A CN2010102414338A CN201010241433A CN101931784A CN 101931784 A CN101931784 A CN 101931784A CN 2010102414338 A CN2010102414338 A CN 2010102414338A CN 201010241433 A CN201010241433 A CN 201010241433A CN 101931784 A CN101931784 A CN 101931784A
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Abstract
The invention discloses a method for encrypting and decrypting a recorded digital television program through a high-bandwidth digital content protection (HDCP) key. In the method, encrypting and decrypting operation is performed on the recorded content by using the HDCP key carried by a high-definition multimedia interface (HDMI); and an equipment serial number, namely a key selection vector (KSV) is added during the encrypting and decrypting operation. Due to the uniqueness of the KSV carried by a television set or a set-top box, the recorded content is encrypted and decrypted, so that the digital program recorded through the digital television set or the digital set-top box can only be played on the digital television set or the digital set-top box per se.
Description
Technical field
The present invention relates to the broadcast of digital television program, particularly a kind of method of the digital television program of recording being carried out encryption and decryption by the HDCP key.
Background technology
Along with the development of Digital Television, television operator has been released a series of charging TV programs, and the user just has authority to watch after must handling the relevant formality of paying the fees.Restriction is encrypted in recording all of current most of digital television program, can play on a series of products at the digital television program that a television set or set-top box are recorded.Therefore, the user's recorded program of paying the fees can offer other users that do not pay the fees and watch, and is not subjected to the restriction of television operator.This way makes the digital program benefits of operators can not get ensureing.
Summary of the invention
The object of the present invention is to provide a kind of method of the digital television program of recording being carried out encryption and decryption by the HDCP key.
Deciphering two parts when encryption that the present invention proposes when passing through method that the HDCP key carries out encryption and decryption to the digital television program of recording and comprising program recording and broadcast program, concrete steps are as follows:
Encryption when recording digital program:
Step S1: when digital television program recording, the sequence number (KSV) of ciphering unit readout equipment from the device of storage HDCP key;
Step S2: in the process of program recording digital television program (TS stream) is carried out cryptographic calculation, add the KSV content in this cryptographic calculation, generation contains the HDCP key K ey1 of KSV content and the encrypt file A of digital television program (TS stream).
Decryption processing when playing program recording:
Step S3: when playing digital television program, the HDCP cipher key content Key1 that decrypting device reading encrypted file A is embedded;
Step S4: read the HDCP key K ey2 that this machine carries from playback equipment HDCP crypto key memory spare;
Step S4: comparison Key1 and Key2, if Key1 is consistent with Key2, the digital television program (TS stream) that reduction comprises from encrypt file A is also play; If Key1 and Key2 are inconsistent, the demonstration inactive file also returns.
The invention provides and a kind ofly the digital program of recording is carried out the method for encryption and decryption, realized that this machine only records the purpose that can put in this machine sowing, help protecting the intellectual property and benefits of operators by the HDCP key.
Description of drawings
The flow chart that Fig. 1 encrypts for the present invention;
The flow chart that Fig. 2 is decrypted for the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.
In recent years, a kind of HDCP technology HDCP (High-bandwidth Digital Content Protection) has appearred.The appearance of HDCP has guaranteed that the high definition signal of HDMI (High-Definition Multimedia Interface) or DVI (Digital Visual Interface) transmission can illegally not recorded.The HDCP technical specification is finished by Intel Company is leading, and when the user carried out bootlegging, this technology can be disturbed, and reduces the quality of the image that duplicates out, thereby content is protected.The principle of HDCP is, all store an available key collection at transmitting terminal and receiving terminal, these keys all are secret storages, transmitting terminal and receiving terminal all carry out the encrypting and decrypting computing according to key, in such computing, can add some special value KSV, the cryptography processing units of transmitting terminal and receiving terminal is checked the other side's KSV value, with the legitimacy of guaranteeing to connect.
Most existing digital television and digital TV set-top box all have recording function and HDMI interface, if at the HDMI interface HDCP key is set, this HDCP key has uniqueness, just can protect recorded program.
The present invention carries out the encryption and decryption computing by the HDCP key that utilizes HDMI and have to recorded content, and adds a special value calculate the video-encryption key in the computing of encryption and decryption.Should special value select Equipment Serial Number (KSV) for use, because the uniqueness of the KSV sequence number that television set or set-top box are carried, realized encryption and decryption, the digital program of recording by digital television or top box of digital machine can only be put in this machine sowing recorded content.
Based on above-mentioned principle, the deciphering two parts when encryption that the present invention proposes when passing through method that the HDCP key carries out encryption and decryption to the digital television program of recording and comprising program recording and broadcast program, concrete steps are as follows:
Encrypt (recording digital program):
Step S1: when digital television program recording, the sequence number (KSV) of ciphering unit readout equipment from the device of storage HDCP key;
Step S2: in the process of program recording digital television program (TS stream) is carried out cryptographic calculation, and adding contains the KSV content in this cryptographic calculation, generation contains the HDCP key K ey1 of KSV content and the encrypt file A of digital television program (TS stream).
Deciphering (broadcast recorded content):
Step S3: when playing digital television program, the HDCP cipher key content Key1 that decrypting device reading encrypted file A is embedded;
Step S4: read the HDCP key K ey2 that this machine carries from playback equipment HDCP crypto key memory spare;
Step S4: comparison Key1 and Key2, if Key1 is consistent with Key2, the digital television program (TS stream) that reduction comprises from encrypt file A is also play; If Key1 and Key2 are inconsistent, the demonstration inactive file also returns.
Claims (1)
1. one kind is carried out the method for encryption and decryption by the HDCP key to the digital television program of recording, and it is characterized in that comprising the following steps:
Encryption when recording digital program:
Step S1: when digital television program recording, the sequence number (KSV) of ciphering unit readout equipment from the device of storage HDCP key;
Step S2: in the process of program recording digital television program (TS stream) is carried out cryptographic calculation, add the KSV content in this cryptographic calculation, generation contains the HDCP key K ey1 of KSV content and the encrypt file A of digital television program (TS stream);
Decryption processing when playing program recording:
Step S3: when playing digital television program, the HDCP cipher key content Key1 that decrypting device reading encrypted file A is embedded;
Step S4: read the HDCP key K ey2 that this machine carries from playback equipment HDCP crypto key memory spare;
Step S4: comparison Key1 and Key2, if Key1 is consistent with Key2, the digital television program (TS stream) that reduction comprises from encrypt file A is also play; If Key1 and Key2 are inconsistent, the demonstration 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 |
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| 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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| CN101931784A true CN101931784A (en) | 2010-12-29 |
| CN101931784B CN101931784B (en) | 2015-07-29 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102831352A (en) * | 2012-09-11 | 2012-12-19 | 南京天溯自动化控制系统有限公司 | Equipment authorization use method and equipment for method |
| CN103065068A (en) * | 2012-12-19 | 2013-04-24 | 深圳创维－Rgb电子有限公司 | Method and device for encrypting recorded documents |
| CN103200442A (en) * | 2013-04-07 | 2013-07-10 | 四川长虹电器股份有限公司 | Method for using set top box to control high-definition program playing |
| 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 of HDCP function |
| WO2016145558A1 (en) * | 2015-03-13 | 2016-09-22 | Lattice Semiconductor Corporation | Maintaining synchronization of encryption process across devices by sending frame numbers |
| CN106229007A (en) * | 2016-08-09 | 2016-12-14 | 广州视源电子科技股份有限公司 | HDCP KEY sending method, method for burn-recording 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 |
| CN110062294A (en) * | 2019-04-24 | 2019-07-26 | 晶晨半导体(上海)股份有限公司 | Method for transmitting signals and system based on HDCP key |
| CN111405366A (en) * | 2020-03-09 | 2020-07-10 | 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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| 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 |
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| 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 |
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| CN103065068A (en) * | 2012-12-19 | 2013-04-24 | 深圳创维－Rgb电子有限公司 | Method and device for encrypting recorded documents |
| 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 |
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| WO2016145558A1 (en) * | 2015-03-13 | 2016-09-22 | Lattice Semiconductor Corporation | Maintaining synchronization of encryption process 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 of HDCP function |
| CN106229007A (en) * | 2016-08-09 | 2016-12-14 | 广州视源电子科技股份有限公司 | HDCP KEY sending method, method for burn-recording and device |
| 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, method for burn-recording 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 |
| CN110062294A (en) * | 2019-04-24 | 2019-07-26 | 晶晨半导体(上海)股份有限公司 | Method for transmitting signals and system based on HDCP key |
| 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 |
| CN111405366A (en) * | 2020-03-09 | 2020-07-10 | 深圳创维－Rgb电子有限公司 | Key file synthesis method and device and computer readable storage medium |
| 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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