Encryption and decryption methods of streaming media on-demand system

Abstract

The invention provides fragmentation encryption and fragmentation decryption methods of on-demand streaming media files. The fragmentation encryption method comprises the following steps that: a fragmentation encryptor carries out fragmenting with a fixed size to the media files and generates one content secret key and one secret-key random number for each fragment; the fragmentation encryptor calculates a fragmentized secret key according to the fragmentized content secret key, the secret-key random number and a preset secret-key exported function and uses the fragmentized secret key to encrypt the current fragment; the secret-key random number is embedded in the fragment. The decryption method comprises the following steps that: a client receives the content secret key, the secret-key random number of a first fragment and the preset secret-key exported function, calculates a first fragmentized secret key and decrypt the fragment; the secret-key random number of the next fragment is extracted so as to calculate a decryption key of the next fragment. In the invention, media files are fragmentized; different secret keys are used to encrypt each fragment; the secret key can be obtained only through calculating the content secret key, secret-key random number and the preset secret-key exported function.

Description

technical field [0001] The invention is an encryption and decryption method in the process of media file transmission. It is mainly used to solve the encryption and decryption problems in the streaming media on-demand system. Background technique [0002] With the development of modern network technology, the network began to bring people various forms of information. From text information to video and audio information, and for video and audio information with a large amount of data, users have to spend a lot of time waiting for the transmission of these data, and streaming media technology came into being to solve this problem. [0003] Streaming media technology is a multimedia online playback technology that has emerged in recent years. This technology uses streaming to transmit and play streaming media data on the network. One of the biggest advantages of streaming media technology is that users do not need to spend a long time downloading all multimedia files to the ...

AI Technical Summary

Problems solved by technology

In the prior art, when the segmental encryptor encrypts the on-demand streaming media file, it only encrypts the media file through a content key, and the content key remains unchanged throughout the whole process, so the encryption is relatively Simple, greatly reducing the security of on-demand streaming media files, the corresponding client uses the received content key to decrypt and play the media file, once other users obtain the key, they can play the entire media file, greatly Reduced security for on-demand streaming files

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