Component-based digital watermarking of Chinese texts

ABSTRACT

According to the types of the host media, digital watermarking may be classified mainly as image watermarking, video watermarking, audio watermarking, and text watermarking. The principle of the three watermarking research fields are similar in that they make use of the redundant information of their host media and the characteristics of human video system or human audio system. Unfortunately, text has no redundant information. Text watermarking techniques are totally different from them. And text watermarking algorithm is very difficult to satisfy the requirements of transparence and robustness. In this paper, a novel text watermarking algorithm based on the thought of the mathematical expression will be presented. Since watermarking signals are embedded into some Chinese characters that can be divided into left and right components, this algorithm is totally based on the content. Therefore, it breaks through the difficulties of text watermarking. Experiments also show that the component-based text watermarking technique is relatively robust and transparent. It will play an important role in protecting the security of Chinese documents over Internet.

REFERENCES

• 1: Mikhail J. Atallah , Victor Raskin , Christian Hempelmann , Mercan Karahan , Radu Sion , Umut Topkara , Katrina E. Triezenberg, Natural Language Watermarking and Tamperproofing, Revised Papers from the 5th International Workshop on Information Hiding, p.196-212, October 07-09, 2002
• 2: Brassil, J., Low, S., Maxemchuk, N. F., and O'Gorman, L. Electronic Marking and Identification Techniques to Discourage Document Copying. IEEE Journal on Sel. Areas in Commun., 13(8) (1995) 1495--1504.
• 3: Brassil, J., Low, S., and Maxemchuk, N. F. Copyright Protection for the Electronic Distribution of Text Documents. Proceedings of the IEEE, 1999, 87(7).
• 4: Ingemar J. Cox , Matt L. Miller, The first 50 years of electronic watermarking, EURASIP Journal on Applied Signal Processing, v.2002 n.2, p.126-132, February 2002 [doi>10.1155/S1110865702000525]
• 5: Fridrich, J., and Goljan, M. On Estimation of Secret Message Length in LSB Steganography in Spatial Domain. In Proc. of SPIE Symposium on Electronic Imaging, USA, 2004.
• 6: Huang, D., Yan, H. Interword distance changes represented by sine waves for watermarking text images. IEEE Trans. On Circuits and Systems for Video Technology, 2001, 11(12):1237--1245.
• 7: Sun, X. M., Chen, H. W., Yang, L. H., and Tang, Y. Y. Mathematical Representation of a Chinese Character and its Applications. International Journal of Pattern Recognition and Artificial Intelligence. 16(8)(2002), 735--747.
• 8: Tanaka, K., Nakamura, Y., and Matsui, K. Embedding secret information into a dithered multi-level image. In Proc of 1990 IEEE Military Communications Conference, 1990:216--220.

INDEX TERMS

Primary Classification:
  D. Software
  D.4 OPERATING SYSTEMS
      D.4.6 Security and Protection

General Terms:
Algorithms, Security, Verification

Keywords:
chinese character, component, digital watermarking, mathematical expression, robust, text watermarking