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数字保护技术HDMI与DVI的区别

date:On November 02, 2017 Source:  

   每次看到HDCP的数字保护技术的时候都会想HDMI与DVI,现在比较常用的两种传输设备随处可见,那么数字保护技术是加在什么地方的呢,有的人说是加在HDMI线和DVI线里面,还有的说是在接口里面,然后还有的更是多在DVI光纤延长器里面,真是哭笑不得啊,其实HDCP技术在影音内容的整个传送过程中都实施了保护,下面来介绍。

Every time you see HDCP digital protection technology will want HDMI and DVI, now more commonly used two kinds of transmission equipment can be seen everywhere, then the digital protection technology is added to what place, some people say that is added to the HDMI cable and DVI cable inside, there is said in the interface inside, and then there are more in the DVI fiber extender inside, really dumbfounding ah, in fact, HDCO technology in the entire audio and video content transmission process are implemented protection, the following to introduce The.


   例如在电脑平台上,受到HDCP技术保护的影音内容在输出时,微软操作系统中的COPP(CertifiedOutputProtectionProtocol,认证输出保护协议)驱动首先会验证显卡,只有支持HDCP的显卡才能实现内容的输出;随后操作系统会认证显示设备的密钥,只有符合HDCP要求的设备才能最终显示显卡传送来的影音内容。

For example, in the computer platform, by the HDCP technology to protect the audio and video content in the output, Microsoft operating system COPP (CertifiedOutputProtectionProtocol, certified output protection protocol) driver will first verify the graphics card, only support HDCP graphics card to achieve the output of the content; The system will verify the display device key, only in line with HDCP requirements of the equipment in order to finally display the video card to the audio and video content.


   在整个传输过程中,发送端和接收端都存储了一个可用密钥集,这些密钥都被秘密地存储起来,发送端和接收端根据密钥进行加密解密运算。在加解密运算中还要加入一个特别的值——KSV(KeySelectionVector,密匙选择矢量)。支持HDCP的每个设备都会有一个唯一的KSV序列号,发送端和接收端的密码处理单元会核对对方的KSV值,以确定连接是合法的。其详细过程为:发送端会由自己的密码引擎产生一个64bit的伪随机序列An,并将其和自己的KSV同时发送给接收端。接收端会随后反馈回自己的KSV和Repeater位。两个KSV必须符合正确的格式,都由20个0和20个1组成。发送端和接收端的密码处理单元会独立地计算出各自的R0、Mo和Ks的值,然后将两个R0值进行比较,只有在两者完全吻合的情况下才会通过认证。

Throughout the transmission process, the sender and the receiver have stored an available key set, these keys are stored in secret, the sender and the receiver according to the key encryption and decryption operations. In the encryption and decryption operations also add a special value - KS (KeySelectionVector, key selection vector). Each device that supports HDCP will have a unique KSV serial number. The sending and receiving end of the cryptographic processing unit will check the KSV value of the other party to determine that the connection is legal. The detailed process is:. The sender will generate a 64-bit pseudo-random sequence from its own cryptographic engine and send it to its receiver at the same time as the receiver. The receiver will then feed back to its own KSV and relay bits. The two KSVs must conform to the correct format, consisting of 20 0s and 20s. The cryptographic processing unit of the transmitter and receiver will independently calculate the values of the respective R0, molybdenum and Ks, and then compare the two R0 values to pass the certification only if they are fully matched.


   在加密过程中,HDCP会对每个像素进行处理,使画面变得毫无规律、无法识别。而只有相互认证同步(?)后的发送端和接收端才能进行解密运算,还原数据。关于HDCP采用的加密方式没有找到资料以供研究。

In the encryption process, HDCP will deal with each pixel, so that the screen becomes no law, can not be identified. And only mutual authentication synchronization (?) After the sender and receiver can decrypt the operation, restore the data. There is no information on the encryption used by HDCP for research.


   通过HDCP的解说了解更多的保护加密技术,这项技术为我们的影音行业带来了巨大的作用,为了保证HDMI或者DVI传输的高清晰信号不会被非法录制,就出现了HDCP技术。HDCP技术规范由Intel领头完成,当用户对高清晰信号进行非法复制时,该技术会进行干扰,降低复制出来的影像的质量,从而对内容进行保护。

Through the HDCP explanation to understand more protection and encryption technology, this technology for our audio and video industry has brought great effect, in order to ensure that HDMI or DVI transmission of high-definition signals will not be illegally recorded, there HDCP technology. HDCP technical specifications by the Intel lead to complete, when users of high-definition signals for illegal copying, the technology will interfere, reduce the copy of the image quality, so as to protect the content.


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