| Instant Messaging Software is playing a very important role in people's daily life because of its flexibility and convenience. SIP protocol as simple and easy to use, Obtain wide support from the field of wide-area network transmission. And it is also widely used as the instant messaging software's protocol. However, because of lack security research, SIP network has faced many security threats. Not enough for high-security requirements situation block the Sip's development and widely use. SIP security problems have become increasingly prominent.Therefore, Enhancing Sip's security is this paper's purpose. Extremely, about the security of audio communicate. In SIP communication, in order to guarantee the audio communication's security, the audio date should be encrypted. In this paper, the audio data encryption proposed several methods, in these methods, some audio data encryption method is better than others. First analysis of a specific audio coding, understanding of all types of data in the audio coding, and select the one which have the smallest data, then, encrypted this type of data. Because of reduced the amount of encryption data, it can enhance the speed of encryption. Secondly, the use of multi-key distribution raised the strength of encryption system.Audio data encryption can guarantee audio communication's security. However, because of the research on a specific audio coding it reduce the universal of this method. Noise control and audio synchronization are all need further study. |
