The Secure Transmission And Management Of Multimedia Information

With the development of multimedia coding, compression and transmission technology, the multimedia technology has been used in many fields such as military affairs, business and so on. Therefore, the security of multimedia is increasingly attracted attention, particularly in some sensitive places. In this paper, the multimedia information security has been divided into two parts: one part is the secure transmission of multimedia information, and another is the secure management of multimedia information. The secure transmission is responsible for the security of multimedia information in the course of transmission, while the main task of secure management is to supply the security service to the secure transmission part, which includes certificate service system, the decision of multimedia encryption method, the access control of media server and so on.In this paper, the multimedia information security system is proposed with the consideration of multimedia collection, transmission, as well as playing, which is used to ensure the security of multimedia transmission and management. In the secure system, the secure management includes the certificate service system and access control model of mutimedia server. The multimedia server uses Web to provide a variety of services which include the'play','add','delete'of the media data as well as the'add','modification'of media user. Therefore, the web access control decision model should be introduced to judge whether the user has the right to do the corresponding operation. In addition, the multimedia requesting access control decision model is also introduced, which is used to realize the authentication, right decision and the selection of the encryption method during multimedia requesting.In the security system, the secure multimedia transmission scheme is proposed to protect the multimedia information during transmission. This scheme is mainly used in multimedia requesting, however, with some adjustment, it also can be used in multimedia collection situation. The secure transmission includes handshake protocol and key synchronization scheme. The handshake protocol can implement the traditional key exchange, and with the multimedia requesting decision system, the protocol also allow the users to select the suitable multimedia encryption method according to the working environment. The key synchronization scheme can ensure the users to decrypt the multimedia data correctly in the situation of package losing and disordering in the internet.