中文摘要：

针对图像空域随机LSB信息隐藏,重点研究隐写嵌入对隐写轨迹上像素间关联性的影响,通过提取隐写密钥对应的隐写轨迹上像素多方向关联化互信息特征,在互信息值与隐写密钥间建立映射对应关系,从而在隐写密钥空间内甄别出真伪隐写密钥,最终实现提取攻击获得隐写密钥.在隐写密钥提取攻击测试中表明,本文提出的方法能够针对随机LSB替换和随机LSB匹配嵌入实现提取攻击,与现有的提取攻击方法相比具有更高的提取攻击准确率,在不同的图像集下能够保持较好的隐写密钥提取攻击效果.

英文摘要：

In this paper, we focus on the effects of steganographic embedding to the correction among steganography pixels on track against the spatial random LSB image steganography. Then, for each stego key in the keyspace, a multi-directional associative mutual information （MAMI） feature has been extracted on the track which controlled by the stego key. And, a mapping correspondence between MAMI feature and stego key is established. According to this approach, the correct key can be identified in the stego keyspace. The experimental results demonstrate that the method which has been introduced can estimate the stego key in random LSB replacement embedding and random LSB matching embedding. The method has better accuracy of detection accuracy compared with existing methods and it can ensure the great effects in various kinds of image sets.