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Understanding the HDCP Master Key Leak

Sep 16, 2010, 23:04 (2 Talkback[s])
(Other stories by Ed Felten)

"On Monday, somebody posted online an array of numbers which purports to be the secret master key used by HDCP, a video encryption standard used in consumer electronics devices such as DVD players and TVs. I don't know if the key is genuine, but let's assume for the sake of discussion that it is. What does the leak imply for HDCP's security? And what does the leak mean for the industry, and for consumers?

"HDCP is used to protect high-def digital video signals "on the wire," for example on the cable connecting your DVD player to your TV. HDCP is supposed to do two things: it encrypts the content so that it can't be captured off the wire, and it allows each endpoint to verify that the other endpoint is an HDCP-licensed device. From a security standpoint, the key step in HDCP is the initial handshake, which establishes a shared secret key that will be used to encrypt communications between the two devices, and at the same time allows each device to verify that the other one is licensed."

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