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The Design and Study of PVR Set-Top Box Based on AES Algorithm

Author: WangJinBo
Tutor: FangGuoZhi
School: Harbin University of Science and Technology
Course: Communication and Information System
Keywords: Set-top boxes Personal video AES algorithm FAT32
CLC: TN948.55
Type: Master's thesis
Year: 2009
Downloads: 79
Quote: 0
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Abstract


Function in digital TV set-top boxes , digital video recorders (PVR) currently occupy an increasingly important position in people's lives . Papers PVR set-top box design , based on the AES encryption algorithm is applied to the set-top boxes , effective copyright protection have become a trend for PVR set-top box users will have recorded programs for illegal distribution . By analyzing the domestic and international PVR set-top box and AES algorithm development , pointed out that the high real-time , high-security , low complexity , is continuing to pursue the goal of video encryption , AES algorithm has a huge advantage in this regard . Design using EMMA3SL chip solution , PVR set-top box hardware signal workflow , AES encryption and decryption process on the demultiplexing and PES analysis . The scheme can reduce the amount of data to be encrypted to improve the efficiency of the CPU usage , the AES algorithm and PVR STB combined . AES encryption of audio and video streaming , each 128bit divided into groups , each group of 10 byte substitution , line shift , columns confusion and operations such as round keys plus using C language completion of AES encryption and decryption process . On this basis the fast encryption and decryption implementations column confused with all the changes to the look-up table operation , operating only shift , look-up table , XOR algorithm speed greatly improved . Finally , to achieve the storage of the encrypted data and decrypt the data read process . PIO hard drive read-write mode , fast hard drive access . PVR file system , FAT32 storage . Achieved through the dynamic allocation of cluster the PVR basic playback functions ; using a hard physical order placed to complete and optimize the time-shift function , achieve better results . Experimental results show that the hard disk is removed from the set-top box connected to another computer , the hard program can not be played , indicating the feasibility of the program 's video program is encrypted . Conduct time-shift operation and playback of encrypted program , the effects were very smooth. The design PVR set-top boxes in the encryption and decryption speed , hard disk access time , are improved .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > TV > TV and television equipment > Television transmitter and receiver equipment > The receiving device
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