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HDCP, High -Bandwidth Digital Content Protection: Beginners Guide

Background:

High-definition digital video allows users to enjoy near-perfect high-resolution video content. As more and more content is delivered digitally, content creators are increasingly concerned about content piracy because digital content can be perfectly duplicated. Therefore, anti-piracy safeguards such as High Bandwidth Content Protection (HDCP) are necessary for original content creators to protect their assets. In this article, we will discuss the key points of HDCP

What is HDCP:

High-Bandwidth Digital Content Protection, HDCP, is an encryption scheme developed to defend against uncontrolled copying of digital content over high-bandwidth digital interconnects such as DVI and HDMI. The FCC approved HDCP as a “digital output protection technology” on August 4, 2004.

An HDCP protected system consists of: 1) the HDCP transmitter (DVD player for example), 2) the digital interface (DVI or HDMI), and 3) the HDCP receiver (your display screen). In short, the content is encrypted at the transmitter and the signal is transmitted to the HDCP receiver (display) over the DDC lines (essentially an I2C bus) where it is decrypted before viewing. HDCP requires both transmitter and receiver to be standards compliant. If either does not comply, the video will not display correctly. Incidentally, HDCP does not apply to analog interface such as component video although component video can be used to display high definition video.

Why should the consumer care about HDCP:

Consumers are strongly recommended to be aware of HDCP and purchase HDCP compliant sets. Here’s why. It has been speculated that the two competing high definition DVD standards HD DVD and BLUE RAY, planned for 2006, will only provide full resolution on HDCP protected outputs such as HDMI or DVI. If true, users must have an HDCP monitor to enjoy full resolution HD DVD technology. Therefore, it is prudent for the consumer to select HDCP compliant displays so that the display can be used with future applications.

What is an HDCP session:

HDCP is a complicated process but can be broken down into 3 key functions: Authentication, Encryption and Renewal.

Authentication: The first step before video is actually sent is for the HDCP sender to determine if the receiver is “allowed” to accept HDCP protected content. Stored in the PROM of each transmitter and receiver is an array of 40 56-bit secret keys and a 40-bit entity called Key Selection Vector. Authentication requires the sender and receiver pair to exchange “secret keys” and key selection vectors. The keys are scrambled and never revealed. The math behind the encryption allows each half to calculate a resulting number, call it Rs, based on the key exchanges. The Rs value is then shared and compared. If the Rs value matches, the receiver is accepted as an authorized HDCP receiver and video transmission can begin.

Encryption/Transmission: After authentication is complete, video content transmission can begin. To prevent an unauthorized receiver from receiving the content, the video data must be encrypted before transmission. At the transmitter end, the video data bits are exclusive gold with a shared calculated number, let’s call it Rt (Rt is similar to how Rs was calculated) and sent to the receiver. At the receiver end, the encrypted data is again exclusive gold with Rt. Since the XOR function is invertible, XORing with the same Rt at the receiver end will reveal the true unscrambled video bits. Incidentally, a new Rt value is calculated approximately every 2 seconds to avoid corruption due to hacking.

Renewability: Renewability ensures that private keys are not exposed to unauthorized users due to tampering.

Conclusion:

HDTV technology is changing rapidly. Content providers must protect against piracy by implementing HDCP. HDCP and digital connection standards such as HDMI will become the de facto standard for digital video connections. We have described the important characteristics of HDCP, so that the consumer can make smart purchasing decisions.

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