Abstract
Voice-over IP (VoIP) technology is a kind of digital transmission technology based on IP network. It is one of the important methods to use voice service in VoIP as steganographic carrier to ensure secure transmission. However, the traditional steganographic code has some problems, such as low embedding efficiency and weak concealment, which cannot meet the requirements of VoIP streaming media information hiding for the security of secret information. Therefore, a steganographic algorithm combining F5 and simplified wet paper code (SWPC) algorithm is proposed. The main idea is to embed secret messages in each row of the carrier matrix using the F5 algorithm, and then the SWPC algorithm is used to embed the columns according to the wet and dry characteristics of the wet paper code without affecting the results before row embedding. We use the VoIP streams encoded by the ITU-T G.729a codec as a carrier to verify the proposed scheme. The experimental results demonstrate that the proposed scheme can achieve relatively better IP speech data steganographic transparency and that it can outperform F5-WPC and SWPC approaches.
Highlights
Information hiding is a new type of secure communication technology that can hide secret information in a seemingly ordinary carrier to achieve the purpose of secrecy and security
The research on voice over IP (VoIP) streaming media information hiding can be divided into two directions: one is the information-hiding method based on voice carrier, whereas the other is the information-hiding method based
AN ENHANCED STEGANOGRAPHIC CODE CONSTRUCTION METHOD FOR VoIP In this paper, we present a construction method for IP speech streams, combining F5 and simplified wet paper code (SWPC) codecs
Summary
Information hiding is a new type of secure communication technology that can hide secret information in a seemingly ordinary carrier to achieve the purpose of secrecy and security. In view of the problem, this article proposes a steganographic code for enhanced VoIP steganographic method It takes advantage of VoIP voice services as the steganographic carrier combines the F5 coding algorithm and Simplified Wet Paper Code (SWPC) coding algorithm and embeds secret messages into the VoIP streams. Matrix coding was first applied to F5 algorithm, which can embed x bit secret information by modifying 1 bit at most on n (n = 2x − 1) bit carrier, greatly increasing the embedding efficiency of steganography, and reducing the distortion brought by embedding to carrier, achieving a qualitative leap in non-aggressiveness [23]. The extraction function of F5 algorithm can be defined as follows:
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