Text split-based steganography in OOXML format documents for covert communication

Authors:
Zhangjie Fu;Xingming Sun;Yuling Liu;Bo Li
Affiliations:
College of Information Science and Engineering, Hunan University, 410082, Changsha, China;Jiangsu Engineering Center of Network Monitoring, Nanjing University of Information Science and Technology, 210044, Nanjing, China;College of Information Science and Engineering, Hunan University, 410082, Changsha, China;College of Information Science and Engineering, Hunan University, 410082, Changsha, China
Venue:
Security and Communication Networks
Year:
2012

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Abstract

A new steganographic method for data hiding in Microsoft Word 2007–2010 (Microsoft Corp., Redmond, WA, USA) files that use Office Open XML (OOXML) format is proposed. Secret information can be imperceptibly embedded into OOXML documents by splitting up the printable text, which is defined by the main document body of the OOXML format document. The number of printable words contained in each segment represents the secret message. Theoretical analysis demonstrates that embedding bit rate of the proposed method can take the maximum value (0.8) when 2 bits of secret message are embedded into each segment. Experiments show that 0.44 bit is embedded into each word and 1/151 bit is embedded into each bit of the document on average, which is higher than contemporary linguistic steganography approaches. The method can resist “Format”, “Impersonation”, “Save As”, “Copy”, and other active attacks, and all these changes will not be shown on the MS Office screen display. Therefore, the proposed method can apply to the fields of covert communication and security protection for OOXML format documents. Copyright © 2011 John Wiley & Sons, Ltd.