System and method for encrypting and decrypting MPEG (Moving Picture Experts Group) video based on position files

Abstract

The invention discloses a system and a method for encrypting and decrypting MPEG (Moving Picture Experts Group) video based on position files. The system comprises a video server, a secret key packet and a client. The invention is characterized in that: the video server is internally provided with a video request processing mechanism, a position file generating mechanism, an encrypting control mechanism, an encrypting mechanism and a data transmission mechanism. The video request processing mechanism receives video requests transmitted by a user, extracts the video file name requested by the user and transmits the video file name to the encrypting control mechanism; the position file generating mechanism generates position files corresponding to the video file according to the video file and transmits the position files to the encrypting control mechanism; the encrypting control mechanism receives the video file name provided by the video request processing mechanism, receives the position files provided by the position file generating mechanism and obtains corresponding video files according to the video file name and the position files; and the encrypting mechanism encrypts the corresponding video files. The invention has high efficiency, safety and flexibility.

Description

technical field [0001] The invention belongs to the encryption and decryption system of MPEG video files, in particular to an efficient and safe MPEG encryption and decryption system and method based on location files. Background technique [0002] Recently, with the continuous development of networks and various multimedia technologies, the transmission and application of multimedia data (including images, video and audio, etc.) has become more and more extensive. A video server is a type of server used to transmit video data to a large number of users. field. Among them, video on demand and other entertainment industries are most widely used. For reasons of copyright protection, fees, privacy and sensitivity, many transmitted videos require encryption. [0003] At present, the MPEG encryption method on the server mainly has the following three types according to the relationship between the encryption algorithm and the compression encoding process: the first type, which...

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Problems solved by technology

[0003] At present, the MPEG encryption method on the server mainly has the following three types according to the relationship between the encryption algorithm and the compression encoding process: the first type, which regards multimedia data as ordinary data and directly encrypts it, called the direct encryption method, which does not have format compatibility , obviously not suitable for MPEG encryption for video servers

The second category, according to the idea of ​​selecting and encrypting data that has a great influence on the video, chooses to encrypt a part of the data, which is called a selective encryption method; the third category, the algorithm that combines the encryption process and the compression coding process, that is, the compression with encryption function Algorithms, the latter two algorithms have format compatibility and operability, but they are obviously inefficient when applied to video servers

Since the amount of video data is usually large, the server assigns different keys to different users. For each video request from a user, if the latter two encryption algorithms are used, the decoding operation must be performed first in the process of encrypting the video file. Then encrypt, do a lot of repetitive work on decoding, waste the time of the server, consume a lot of resources of the server, and reduce the service quality of the server

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