Key system for digital television broadcast condition receiving system
A technology of conditional access system and digital TV broadcasting, which is applied in the field of key system, can solve the problems that cannot adapt to the development of digital TV industry, etc., and achieve the effect of protecting security, resisting violent attacks, and improving security
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[0029] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.
[0030] Such as figure 1 As shown, it is a structural block diagram of the key system of the present invention. The present invention provides a key system for a conditional access system of digital television broadcasting, which includes a five-layer key, and the five-layer key is a four-layer symmetric key And a layer of asymmetric key, the four-layer symmetric key includes control word CW (Control Word), service key SK (Service Key), distribution key DK (Distribution Key) and personal key PK (Personal Key ), the one-layer asymmetric key is an ECC key pair.
[0031] Wherein, the control word CW is used to scramble the program content, the service key SK is used to encrypt and protect the control word CW, the distribution key DK is used to encrypt and protect the service key SK, and the personal The key ...
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