Abstract: This paper achieves the qualification of theoretic-security of steganography based on concrete memoryless carriers, by restricting the visual and statistical characteristics of the carrier. It releases the expressions of the capacity of steganography threatened by active or passive attackers. It analyzes the countermeasure essence and defines two strategy sets, including the safe cryptoclastic strategy set and active attack one.

Key words: information-hiding, steganography, theoretic-security, capacity

摘要： 对隐写过程中载体视觉特征和统计特征的变化进行约束，得到了以离散无记忆信源为载体的隐写系统理论安全性条件。分析隐写容量的对策论本质，定义安全隐写策略集和主动攻击策略集，给出了主动攻击情形下和被动攻击情形下的隐写容量表达式。

关键词: 信息隐藏, 隐写术, 理论安全, 容量

CLC Number: 

• TP309