摘要： 通过分析格式化文件PDF(Portable Document Format)文档的数据结构，提出了一种新的基于PDF文档结构的大容量信息隐藏算法。将秘密信息预处理后伪装成合法PDF对象的形式，以文件流的操作方式嵌入到载体文件中，并满足嵌入的信息不影响文件在阅读器、编辑器与打印机中的输出。实验实现了线性化PDF文档的信息隐藏与检测。理论分析与实验结果均表明，该算法具有较大的信息隐藏容量、很快的隐藏与检测速度及依赖于加密算法和密钥的安全性。
关键词:
信息隐藏,
PDF文档,
伪装数据
Abstract: After analyzing the data structures of PDF file, a novel information-hiding method based on the structures of PDF file is proposed. First, the secret data is camouflaged to form the legal PDF object, and then the data will be embedded in the carrier PDF file by operating the document flows. The embedding won’t affect the output of the readers, the editors and the printers. The information hiding and detecting of linearized PDF documents have been implemented. Theoretical analysis and experimental results show that the algorithm can achieve large capability, high speed of hiding and detecting, and security which depends on the encrypted algorithm and the key.
Key words:
Information hiding,
PDF document,
Camouflaged data
刘友继;孙星明;罗 纲. 一种新的基于PDF文档结构的信息隐藏算法[J]. 计算机工程, 2006, 32(17): 230-232.
LIU Youji;SUN Xingming ;LUO Gang. A Novel Information Hiding Algorithm Based on Structure of PDF Document[J]. Computer Engineering, 2006, 32(17): 230-232.