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The Research Based on Features of Chinese Characters in Chinese Text Digit Watermarking Algorithm

Author: HeAn
Tutor: TanJunShan
School: Central South University of Forestry Science and Technology
Course: Applied Computer Technology
Keywords: Text Information Hiding Of Chinese characters Robustness Concealment
CLC: TP309.7
Type: Master's thesis
Year: 2010
Downloads: 86
Quote: 0
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Abstract


From a large number of published papers at home and abroad the existing text information hiding technology widespread among watermark capacity, concealment, robustness, security can not be balanced contradictions and domestic and foreign research is mainly based on the English text The format of information hiding, domestic of a late start in this regard, the basic stay in the supplement and improvement of foreign research, Chinese less. Chinese characters is a distinctive text, its unique structure, information hiding technology based on the English text format mostly do not apply to the Chinese text, use the Chinese character record information for our country such countries, according to the unique characteristics of Chinese characters, research-based Chinese text information hiding will be a great potential research directions. In view of this, in the access to and analysis of a large number of documents on the basis of to join secret information in Chinese Word document used to protect copyright for exploring the starting point for the text watermark algorithm is less robust, hidden enough and watermark capacity is not the problem, studied and proposed the digital watermarking algorithm based on the features of Chinese characters Chinese text. The detailed design process of the algorithm. Commonly used Chinese characters appear a large number of statistical analysis of the frequency and number of strokes drawn based on the average number of strokes will be relatively uniform throughout the text is divided into two blocks Thought; press high and low frequency order in each block of characters sorted, the secret information in the reverse order were repeated embedded into the the kanji text block; when embedding guaranteed the same kanji embedded watermark bit information is the same. 23 embedded position selection strategy, increasing the difficulty of the attacker targeted attacks, improve the ability to recover after an attack watermark. In addition, this paper also studied some of the special attributes of the characters, the attribute values ??to modify or not as a way to watermark embedding does not affect the normal use of the text at the same time has a very high concealment. Meanwhile, in the watermark generation stage is also used public key algorithm RSA asymmetric encryption technology, and fully guarantee the security of the watermark, to prevent unauthorized detection and embedding. And the use of the (7,4) Hamming principle, error correction encoding the watermark information, the use of error correction code detecting the integrity of the text of the watermark, preferably tampering detection and error recovery. Finally, the performance of the watermark extensive testing, targeted to simulate the attack of text digital watermarking. Experimental results show that the algorithm of this paper has obvious characteristics of Chinese text, has a high concealment, robustness and anti-attack capability. The most important feature of the proposed algorithm is strong robustness, able to withstand any attack from the text format and the text content of local failure.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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