关键词: 隐蔽通信, 隐写系统, 主动攻击, 博弈论, 嵌入率, 错误率

Abstract:

To solve the problem of active attack on steganographic system, the counterwork relationship was modeled between steganographier and active attacker. The steganographic game with embedding rate and error rate as the payoff function was proposed. With the basic theory of two-person finite zero-sum game, the equilibrium between steganographier and active attacker was analyzed and the method to obtain their strategies in equilibrium was given. Then an example case was solved to demonstrate the ideas presented in the model. This model not only provides the theoretic basis for steganographier and active attacker to determine their optimal strategies, but also brings some guidance for designing steganographic algorithms robust to active attack.

Key words: covert communication, steganographic system, active attack, game theory, embedding rate, bit error rate