为码控信息嵌入隐写方法构造有效码字的理论基础

IF 0.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC
A. Kobozeva, A. Sokolov
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引用次数: 0

摘要

隐写技术是现代信息安全系统的重要组成部分。与此同时,在现代网络空间的条件下,开发高性能的隐写方法是相关的,这种方法可以对可能的压缩、噪声和模糊攻击具有高水平的抵抗力。其中一种方法是编码控制信息嵌入的隐写方法,它基于用二进制码字对嵌入的信息进行初步编码的思想,其中沃尔什-阿达玛变换的变换具有特定的性质。由于信息嵌入,干扰在容器的Walsh-Hadamard变换域中有特定的定位。本文为进一步改进码控信息嵌入隐写方法中使用的码字奠定了理论基础。结果表明,尽管这些码字仅对Walsh-Hadamard变换的一个给定变换具有理想的效果,但它们在离散余弦变换(DCT)域中同时影响多个变换。引入了选择性系数的概念来估计对给定DCT变换的影响的选择性程度。由于“近邻”效应的存在,随着所用块体尺寸的增加,观察到选择性系数有下降的趋势。这种趋势是由具有相似频率的DCT变换的参与所决定的,这些变换对嵌入信息的可能攻击具有相似的抵抗力。在这种情况下,低频DCT变换的绝对值之和与所有其他DCT变换的绝对值之和的比值随着码字的大小而增加。本文证明并实际证实了码字长度的增加会导致码控信息嵌入隐写方法的抗扰性增加。从理论上论证了进一步改进码控信息嵌入隐写方法中码字的可行方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Theoretical foundations for constructing effective codewords for the code-controlled information embedding steganographic method
Steganography is an important component of modern information security systems. At the same time, in the conditions of modern cyberspace, it is relevant to develop high-performance steganographic methods that would have a high level of resistance to possible attacks by compression, noise, and blur. One of such methods is the steganographic method with code-controlled information embedding, based on the idea of preliminary coding of the information being embedded using binary codewords, for which the transformants of the Walsh-Hadamard transform have the specified properties. A specific localization of disturbances in the Walsh-Hadamard transform domain of the container takes place because of the information embedding. In this paper, a theoretical basis has been formed for further improvement of the codewords used in the code-controlled information embedding steganographic method. It is shown that despite the fact that these codewords have an ideal effect only on a given transformant of the Walsh-Hadamard transform, they affect several transformants at once in the domain of the discrete cosine transform (DCT). The concept of the selectivity coefficient is introduced to estimate the level of selectivity of the impact on a given DCT transformant. It has been established that with an increase in the size of the blocks used, a tendency is observed to a decrease in the selectivity coefficient due to the presence of the “close neighbor” effect. This trend is conditioned by the involvement of the DCT transformants with similar frequencies that have similar resistance to possible attacks on the embedded message. In this case, the ratio of the sum of absolute values of low-frequency DCT transformants to the sum of absolute values of all other DCT transformants increases with the size of the codeword. In this paper it has been proven and practically confirmed that an increase in the size of a codeword leads to an increase in the resistance of the code-controlled information embedding steganographic method. Possible ways of further practical improvement of codewords used in the code-controlled information embedding steganographic method are theoretically substantiated.
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Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia
Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia ENGINEERING, ELECTRICAL & ELECTRONIC-
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