Extracting embedded messages using adaptive steganography based on optimal syndrome-trellis decoding paths  

作　　者：Jialin Li Xiangyang Luo Yi Zhang Pei Zhang Chunfang Yang Fenlin Liu 

机构地区：[1]State Key Laboratory of Mathematical Engineering and Advanced Computing,Zhengzhou,450000,China

出　　处：《Digital Communications and Networks》2022年第4期455-465,共11页数字通信与网络（英文版）

基　　金：upported by the National Natural Science Foundation of China(No.U1804263,61772549,62172435);the Zhongyuan Science and Technology Innovation Leading Talent Project(No.214200510019);Thanks to the recommendation of SPDE2020,which gives us the opportunity to publish an expanded and full version of this paper.

摘　　要：Privacy protection is the key to maintaining the Internet of Things(IoT)communication strategy.Steganography is an important way to achieve covert communication that protects user data privacy.Steganalysis technology is the key to checking steganography security,and its ultimate goal is to extract embedded messages.Existing methods cannot extract under known cover images.To this end,this paper proposes a method of extracting embedded messages under known cover images.First,the syndrome-trellis encoding process is analyzed.Second,a decoding path in the syndrome trellis is obtained by using the stego sequence and a certain parity-check matrix,while the embedding process is simulated using the cover sequence and parity-check matrix.Since the decoding path obtained by the stego sequence and the correct parity-check matrix is optimal and has the least distortion,comparing the path consistency can quickly filter the coding parameters to determine the correct matrices,and embedded messages can be extracted correctly.The proposed method does not need to embed all possible messages for the second time,improving coding parameter recognition significantly.The experimental results show that the proposed method can identify syndrome-trellis coding parameters in stego images embedded by adaptive steganography quickly to realize embedded message extraction.

关 键 词：Information security Image steganography STC coding Parameter recognition 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]