计算机应用 ›› 2012, Vol. 32 ›› Issue (10): 2776-2778.DOI: 10.3724/SP.J.1087.2012.02776

• 信息安全 • 上一篇    下一篇

基于PDF文档结构的数字水印算法

钟征燕,郭燕慧,徐国爱   

  1. 北京邮电大学 信息安全中心,北京 100876
  • 收稿日期:2012-04-09 修回日期:2012-05-21 发布日期:2012-10-23 出版日期:2012-10-01
  • 通讯作者: 钟征燕
  • 作者简介:钟征燕(1986-),女,广西桂林人,硕士研究生,主要研究方向:数字水印、信息安全管理;郭燕慧(1974-),女,河北唐山人,副教授,博士,主要研究方向:内容安全、信息安全管理;徐国爱(1972-),男,江西鄱阳人,教授,博士,主要研究方向:软件安全、信息安全管理、密码学。
  • 基金资助:
    国家发改委信息安全专项;NSFC-广东省自然科学基金项目

Digital watermarking algorithm based on structure of PDF document

ZHONG Zheng-yan,GUO Yan-hui,XU Guo-ai   

  1. Information Security Center, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2012-04-09 Revised:2012-05-21 Online:2012-10-23 Published:2012-10-01
  • Contact: ZHONG Zheng-yan

摘要: 在数字产品日益普及的今天,PDF文档的版权保护问题已成为信息安全领域研究的热点。通过分析PDF文档的结构及相关数字水印算法,针对当前一些大容量文本水印算法存在增加文档大小的缺陷,提出了一种基于PDF文档结构的数字水印算法。该算法利用行末标识符不会在文档中显示的特性,通过等量替换PDF文档中具有固定格式的交叉引用表的行末标识符,来实现水印信息的间接嵌入。实验结果表明,该算法水印容量能满足数字版权保护的要求,隐蔽性好,能抵抗统计等攻击。

关键词: 数字水印, PDF文档, 文档结构, 数字版权保护, 行末标识符, 信息隐藏

Abstract: With the rapid development of digital product, the copyright protection of PDF documents has become a crucial research topic in the information security field. This paper analyzed the structure of PDF documents and the relative digital watermarking algorithms. In order to solve the problem that some large capacity text watermarking algorithms increase the size of the document, the authors proposed a digital watermarking algorithm based on the structure of PDF document. Considering the characteristics that end-of-line marker cannot be shown in the document, this algorithm managed to embed watermark through replacing end-of-line markers of the cross-reference table with a fixed format. The experimental results show that, the proposed algorithm can not only reach the standard of watermark capacity required by digital copyright protection, but also has good concealment and can resist statistics attack as well.

Key words: digital watermarking, PDF document, document structure, digital copyright protection, end-of-line marker, information hiding

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