Making and Breaking HDCP Handshakes
Friday, April 14th, 2006Freedom to Tinker has an interesting post on how HDCP could be broken.
Every new HDCP device is given two things: a secret vector, and an addition rule. The secret vector is a sequence of 40 secret numbers that the device is not supposed to reveal to anybody. The addition rule, which is not a secret, describes a way of adding up numbers selected from a vector. Both the secret vector and the addition rule are assigned by HDCP’s central authority. (I like to imagine that the central authority occupies an undersea command center worthy of Doctor Evil, but it’s probably just a nondescript office suite in Burbank.)
- Link (via Boing Boing)
