A new scheme for covert communication via 3G encoded speech

作者：Miao, Haibo^*; Huang, Liusheng; Chen, Zhili; Yang, Wei; Al-hawbani, Ammar

来源：Computers & Electrical Engineering, 2012, 38(6): 1490-1501.

DOI：10.1016/j.compeleceng.2012.05.003

• AUDIO STEGANALYSIS
• WATERMARKING

Mobile communication through 3G network has grown rapidly in recent years. It might be of interest to transmit secret messages over 3G voice channels. In this paper, we introduce a new covert communication scheme via Adaptive Multi-Rate Wideband (AMR-WB) encoded speech. An adaptive suboptimal pulse combination constrained (ASOPCC) method is presented to embed data on compressed speech signal of AMR-WB codec. The method takes advantage of the "redundancy", created by non-exhaustive search of algebraic code-book, to encode secret information. An embedding factor eta is used to control embedding bits. By properly setting eta, ASOPCC can offer a better trade-off between speech quality and embedding capacity in the process of coding mode switching. Experimental results show that the proposed method is quite promising for both high capacity and good imperceptivity. Although ASOPCC is only applied to AMR-WB codec in this article, it can be further used by any other speech coding based on Algebraic Coded Exited Linear Prediction (ACELP).

• 出版日期2012-11
• 单位中国科学技术大学; 中国科学技术大学苏州研究院