This paper shows how to diffuse a message and hide it in multiple PDF files. Presented method uses dereferenced objects and secret splitting or sharing algorithms. It is applicable to various types of PDF files, including text documents, presentations, scanned images etc. Because hiding process is based on structure manipulation, the solution may be easily combined with content-dependent steganographic techniques. The hidden pages are not visible in typical application usage, which was tested with seven different programs.

中文翻译：

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PDF 文件中的分布式隐写术——隐藏在修改页面中的秘密

本文展示了如何传播消息并将其隐藏在多个 PDF 文件中。提出的方法使用解除引用的对象和秘密分裂或共享算法。它适用于各种类型的 PDF 文件，包括文本文档、演示文稿、扫描图像等。由于隐藏过程基于结构操作，因此该解决方案可以很容易地与依赖于内容的隐写技术相结合。隐藏页面在典型的应用程序使用中是不可见的，这已经用七种不同的程序进行了测试。