混沌文本零水印的词法主动攻击

Lexical active attack on chaotic text zero-watermarking

为了解决传统的密写分析技术对文本零水印失效的问题,提出一种基于词法的主动攻击算法。该算法将目前鲁棒性较好的混沌文本零水印作为攻击对象,采用同义词替换技术,定义了同步攻击和生日攻击两种方法,通过将这两种方法相结合,在词这一级别上实现了对文本零水印的主动攻击。实验结果表明,该算法无需大量改写载体文本即可有效地破坏零水印。

The conventional steganalysis techniques does not work in zero-watermarking technology because it does not modify Carrier text. However, active attack model on text zero-watermarking has not been well studied. In order to solve this problem, an active attack algorithm for text zero-watermarking was proposed. Making use of synonym substitution technology, sync-attack and birthday-attack were defined. Through combining the two active attack methods, a lexical active attack algorithm on text zero-watermarking was designed and implemented. The experimental result shows the proposed algorithm can effectively destroy zero-watermarking without modifying carrier text massively.