关键词: 分类, 文本数字水印, 病毒, 划分

Abstract: It becomes more and more attractive to protect copyrights by text digital watermarking. But the robustness of text digital watermarking algorithms is very weak in a great measure at presently. This paper presents a novel English text digital watermarking algorithm based on the idea of virus. The basic idea of this algorithm lies on dividing an English text into various items according to some letters, then sorting these items into several aggregates, at last an information piece can be inserted into each aggregates. The information piece inserted into an aggregate can be extracted as long as the items of the aggregate are not destroyed entirely. Attacks based on format are invalidated because this algorithm can be executed in TXT files, thereupon the robustness of this algorithm can be ensured very well theoretically. Actually, the splendid performance in robustness of the algorithm is proved by experiments.

Key words: Sort, Text Digital Watermarking, Virus, Division