The summarization of encryption techniques of streaming media information

To ensure the safety of the network communication, the generally-used encryption methods are (classified) into software encryption and hardware encryption. And with respect to the software encryption they can be (divided) into two fields: the symmetrical secret key encryption and unsymmetrical secret key encryption. When it comes to the dynamic information encryption the former method or the combination of the two methods are often used. To encrypt the streaming media information that combines with the audio and video in transmi-ssion network, it is more compatible to have data packets end-to-end encrypted with block cipher of symmetrical secret key encryption. Now the stream media information encryption technologies based on the video transference include nothing but information encryption,information hiding, information camouflage and secret carrying, digital right management etc, among which the digital watermark is one of the hot topics. Although the domestic and (oversees) research level of the streaming media encryption technology has improved greatly, there is not a mature product hitherto.