论文部分内容阅读
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 in measure the security of different steg-anographic systems. However, two examples are presented to show that some limitations 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 clearly seen, and indeed secure steganographic method could be designed.