System and method for a variable key ladder

Details System and method for a variable key ladder System and method for a variable key ladder

2011-04-26

2011-04-26

Pyzocha, Michael (Department: 2437)

Cryptography

Video cryptography

Copy protection or prevention

C380S042000, C380S044000, C726S026000

Reexamination Certificate

active

07933410

ABSTRACT:
A method of generating encryption and decryption keys for a multiple tier, variable key ladder (VKL) hierarchy includes determining a device key based on network connection and configuration data contained in conditional access system firmware, decrypting and extracting a session or category key from an input media stream or an Entitlement Management Message using the device key, and configuring a key ladder in response to at least one Entitlement Control Message (ECM), wherein the key ladder comprises the device key and at least one of (i) a program key, (ii) the session or category key, and (iii) at least one control word.

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