隐写安全性度量模型及其应用

隐写术是一种隐蔽通信手段，安全性和隐藏容量是它的两个基本要求。不同隐写术之间隐藏容量的对比简单直观，而隐写安全性的衡量相对复杂很多，目前尚缺乏有效的度量方法和模型。本文建立图像DCT系数的统计分布模型，基于信息论意义上的隐写系统安全性定义，利用鉴别信息的特性，推导和建立DCT域上的隐写安全性度量。利用此度量对常见空域和DCT域隐写术的安全性进行讨论和分析。

An Model of Evaluating the Security of Steganography and its Application

Steganography techniques is a means of secret communication and needs to satisfy the two fundamental requirements—security and hiding capacity. While it is easy and simple to measure the hiding capacity, there are no operative methods or models to evaluate the security of steganography. In this paper, we model the DC and AC DCT coefficients with Gaussian density and generalized Gaussian density separately, then establish a measure of steganography techniques’ security based on the information-theoretic definition of security. Lastly experiments are provided to analyze the security of the popular embedding techniques in both spatial and DCT domain.