Implementation of Covert Communication Based on Steganography

With the development of Internet and multimedia technology, the information exchanged through Internet not only must be real-time, but also requires security and integrity. In this paper, a SIP (Session Initiation Protocol) UA (User Agent) that can dynamically embed some secret message into the speech carrier with good efficiency is implemented. The principle of the secret communication based on steganography technology over VoIP is introduced, and a new architecture of the software used to transmit the hidden information is proposed. Especially, we adopt a relatively new steganography algorithm, which is referred to as LSB matching method. In addition, an approach for avoiding the loss of secret data based on Redundant Audio Data is presented. Finally, we analyzed the performance of the implemented software.