Encrypting and de-encrypting for program of digital TV system and user cut-in managing method
A digital TV system and access management technology, applied in the fields of decryption, user access management, and digital TV system program encryption, can solve the problems of high cost and difficult technical development, and achieve low cost, low technical development difficulty, and circuit simple effect
Active Publication Date: 2007-01-24
KONKA GROUP
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[0005]Therefore, in view of the above disadvantages such as high cost of encryption and decryption of digital TV program signals and user management methods, difficulty in technology development, etc., it is necessary to develop a simple, easy-to-use, Low-cost digital TV system program encryption, decryption and user access management method
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[0027] image 3 It is the basic encoding format in the transmission process of digital TV signals, and it is also the basic transmission encoding format of general digital signals. In this encoding format, there are three main components including synchronous header, transmission data, and end code. This kind of data structure is called "frame", and digital signals are transmitted frame by frame. The synchronization header and the end code are composed of several bits respectively. Generally, the more bits of the frame, the longer the frame length, and the shorter the interval between two adjacent frames, the number of bits required for the synchronization header and the end code Also more. If the interval between two adjacent frames is very long, only one or two bits are needed for the sync header and end code. The length of the frame is mainly determined by the data content, and the interval between frames is determined by the amount of data transmission. The amount of i...
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This invention discloses a method for managing ciphering, de-ciphering and user access of programs of the digital TV system including generating ciphered data, cryptographic key data and user data at the transmission end, utilizing the ciphered data to replace the synchronous head of the digital TV signals and transmitting code streams to generate ciphered digntal TV signals, transmitting the modulated ciphered digital TV signals, ciphered data and user data to the user end, utilizing the cryptographic key data to recover the synchrous head of the ciphered digital TV signals and transmitting the code stream frames after modulating the received signals at the user end to recover the digital TV signals, then authenticating the authority of the user by the user data and user information stored in the storage of the user end to decide if it continues or stops to recover the synchronous head.
Description
technical field [0001] The invention relates to a digital television system, in particular to a program encryption, decryption and user access management method of the digital television system. Background technique [0002] At present, my country's digital TV programs are preparing to start broadcasting, and digital TV will replace analog TV sets. However, the technical problems of program charging that plague the development of digital TV in my country, that is, the technical problems of program signal encryption and conditional access, have not been very good. solve. [0003] figure 1 and figure 2 Shown is the basic schematic diagram of digital TV broadcasting and reception adopted by most countries in the world at present. figure 1 Shown is the schematic diagram of digital TV program signal transmission, figure 2 Shown is the schematic diagram of digital TV program signal reception. Compared with analog TV, in addition to the different modulation, demodulation, enc...
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Inventor 陶显芳
Owner KONKA GROUP