AMENDATORY DEFINITION OF SECURITY FOR STEGANOGRAPHIC SYSTEM  

作　　者：Song Hui Kong Xiangwei You Xingang 

机构地区：[1]School of Electronic and Information Engineering, Dalian University of Technology, Dalian 116024, China [2]Beijing Institute of Electronic Technology and Application, Beijing 100091, China

出　　处：《Journal of Electronics(China)》2010年第2期267-272,共6页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No.60572111)

摘　　要：The security of steganographic system is significant in this research field. The security defined by relative entropy D (P C || PS )is widely cited to measure the security of different steg-anographic systems. However,two examples are presented to show that some limitations exist in Cachin’s definition. Based on the analysis of a basal hypothesis testing problem,a very useful con-clusion can be drawn to define the security of steganographic system. According to the above illation,an amendatory definition is presented based on the probability of the empirical probability distribution. With the help of new definition,the relationship between security and capacity can be interpreted clearly,and truly secure steganographic method could be designed.The security of steganographic system is significant in this research field. The security defined by relative entropy D（Pc｜｜Ps） is widely cited to measure the security of different steg-anographic systems. However, two examples are presented to show that some limitations exist in Cachin＇s definition. Based on the analysis of a basal hypothesis testing problem, a very useful conclusion can be drawn to define the security of steganographic system. According to the above illation, an amendatory definition is presented based on the probability of the empirical probability distribution. With the help of new definition, the relationship between security and capacity can be interpreted clearly, and truly secure steganographic method could be designed.

关 键 词：SECURITY Steganographic system Relative entropy UNIVERSALITY Hypothesis testing 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]