A new approach to covert communication via PDF files

Authors:
I-Shi Lee;Wen-Hsiang Tsai
Affiliations:
Department of Computer Science, National Chiao Tung University, Hsinchu 30010, Taiwan and Department of Management Information, Technology and Science Institute of Northern Taiwan, Taipei, Taiwan;Department of Computer Science, National Chiao Tung University, Hsinchu 30010, Taiwan and Department of Computer Science and Information Engineering, Asia University, Taichung 41354, Taiwan
Venue:
Signal Processing
Year:
2010

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Abstract

A new covert communication method via PDF files is proposed. A secret message, after being encoded by a special ASCII code and embedded at between-word and between-character locations in the text of a PDF file, becomes invisible in the window of a common PDF reader, creating a steganographic effect for secret transmission through the PDF file. Experimental results show the feasibility of the proposed method.