Abstract:

With respect to information hiding system under passive attacks, a concrete statistical model of information hiding system was built and its performance was analyzed, including security, distortion distance metric, and channel capacity. The solution to channel capacity can be regarded, subjected to average hamming distortion distance and average security coefficient, as an optimization problem,. As long as the required parameters are given, the optimization problem of channel capacity will be easy be solved when using optimization theory. Finally, the channel capacity of statistical model is derived on the condition that both original cover sequence and secret information sequence obey to uniform distributions.

Key words: passive attack, information hiding, channel capacity, optimization theory