A Study Of Chinese Text Watermarking Applied In A Mobile Content Push System

Nowadays, with the rapid development of computer network technology, the dissemination of information becomes more quickly. The way people get the digital content becomes very convenient and diversified. With the mobile communication stepping into the 4G era, and the growing popularity of the mobile platform, the problem of information security on mobile clients attracts more and more attention. On general mobile devices, the use of mobile content push system for issuing digital content is one of the current mainstream application. The digital content on mobile devices is isolated from the sender, and it becomes one of the hottest issues which need to be solved immediately that we make sure the integrity, the non-repudiation of the digital content and digital content copyright protection. In addition to the traditional user authentication, encryption and other means of information security methods, the digital watermarking technology is one of the main techniques for digital content security protection on mobile devices. Because text content has less redundant information, the problem of text content protection has not been well solved. Due to the great differences between Chinese and western text, the research of foreign text watermarking is difficult to be adapted directly to the protection of Chinese text. Hanyu pinyin, as an important phonetic method to Chinese text, has simple and unique structure, as well as a wide range of utilities. Therefore, based on the structural characteristics of Chinese Phonetic Alphabets, it will be a very potential research direction to study the text watermarking based on Chinese Phonetic Alphabets.This paper relies on a real project of a mobile content push system in which a Chinese text watermarking technology has been studied. The main work is as follows:(1) From aspect of the mobile content push technical schemes on Android platform, this thesis compares their advantages and disadvantages. Finally, we choose the mobile content push scheme for our specific platform.(2) According to the demand for copyright security of the Chinese text documents in real-life applications, this thesis studies the structure of the digital watermarking, the embedding method, the structure of Chinese phonetic alphabets, the text zero-watermarking technology and so on to carry out specific research, which designs and implements a Chinese text zero-watermarking algorithm based on the Chinese phonetic alphabets structure--CPAW.(3) This thesis rather specifically describes the CPAW algorithm, which is introduced from the aspect of how to create a flow test environment as well as to simulate all aspects of the trial. Then, based on the performance of the watermarking, this thesis makes several relevant tests on the algorithm, which can visually tell from the experimental results that the proposed text zero-watermarking algorithm can stand the tests. Finally, after comparing the existing variety of text watermarking technologies, this thesis comes up with a comprehensive comparative analysis, which reaches the conclusion of the text zero-watermarking algorithm based on the Chinese phonetic alphabets has much value in theoretical and practical studies.