抗统计分析的ISN随机增量协议隐写算法.doc

抗统计分析的ISN随机增量协议隐写算法
杨智丹1,刘克胜1,陈宇2,陈建熊1
(1. 电子工程学院网络系, 安徽合肥 230037; 2. 北京大学信息科学技术学院, 北京 100871)
摘要:为了增强网络隐蔽通道抵抗检测的能力,研究了协议隐写算法的透明性。通过对Windows 2000操作系统进行的ISN(初始序列号)采样实验建立了系统的ISN生成模型,以此模型为基础提出了一种ISN随机增量协议隐写算法。该算法可以逼真地模拟该平台上的ISN生成算法,产生的ISN分布在视觉和统计特征上与正常系统非常接近。采用相似度指标对实验结果进行了客观性评价,评价结果表明,隐写序列在相似度上逼近了用最小二乘法进行曲线拟合所得的序列,对于现有的统计隐写分析具有透明性。
关键词:信息隐藏;协议隐写;网络隐蔽通道;隐写分析
中图分类号: 文献标识码:A 文章编号:1000-436X(2008)11A-0034-07
Random incremental ISN algorithm of protocol
steganography against statistical steganalysis
YANG Zhi-dan1, LIU Ke-sheng1, CHEN Yu2, CHEN Jian-xiong1
(1. Department work, Electronic Engineering Institute, Hefei 230037, China;
2. School of Electronic Engineering puter Science, Beijing University, Beijing 100871, China)
Abstract: In order to enhance work covert channel’s ability of detection-resistant, the invisibility for protocol steganography was studied. The ISN generation model of Windows 2000 was established through initial sequence number (ISN) sampling experiments of the operation system. With the basis of this model, a steganography named random incremental ISN algorithm was proposed. It could simulate ISN generation algorithm of the platform realistically, and its distribution of ISN was very close to the normal system’s distribution in visual and statistical features. The results of experimental were evaluated objectively with similarity index. And the