Steganography in NFT images

Zichi WANG; Guorui FENG; Xinpeng ZHANG

doi:10.11959/j.issn.2096-109x.2022029

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Steganography in NFT images

Topic: Multimedia Content Security | 更新时间：2024-06-03

- Steganography in NFT images
- Chinese Journal of Network and Information Security Vol. 8, Issue 3, Pages: 18-28(2022)
- 作者机构：
  
  1. 上海大学通信与信息工程学院，上海 200444
  2. 深圳大学深圳媒体信息内容安全重点实验室，广东深圳 518060
- 作者简介：
- 基金信息：
- DOI：10.11959/j.issn.2096-109x.2022029
  CLC： TP309
- Online First：2022-06，
  
  Published：15 June 2022
- 稿件说明：
移动端阅览
Zichi WANG, Guorui FENG, Xinpeng ZHANG. Steganography in NFT images[J]. Chinese Journal of Network and Information Security, 2022, 8(3): 18-28.
DOI：

Zichi WANG, Guorui FENG, Xinpeng ZHANG. Steganography in NFT images[J]. Chinese Journal of Network and Information Security, 2022, 8(3): 18-28. DOI： 10.11959/j.issn.2096-109x.2022029.

摘要

NFT（non-fungible token）图像为元宇宙中进行创作、交易、分享和收藏的数字艺术作品。不同于自然图像，NFT 图像的内容为用户自主定义，在数据空间分布较广，这为秘密信息的隐藏提供了极大便利，因此借助NFT图像进行隐蔽通信成为图像隐写的一个新分支。提出了一种NFT图像的隐写方法。对一幅给定的 NFT 图像，对高频与边缘轮廓部分进行增强，以丰富图像中有利于掩盖隐写修改痕迹的细节部分，从而使增强后的图像更适合隐写，将其作为载体。根据增强前后图像像素的差异确定载体图像各像素加1或减1的倾向修改方向，并根据此差异调整载体各像素的修改代价以满足确定的倾向修改方向，进一步提升隐写抗检测性。利用主流隐写编码框架在载体图像中进行信息嵌入。实验结果表明，所提方法应用于NFT 图像时的抗检测性优于现有的数字图像隐写方案，对于 HILL、MiPOD、DFEI 隐写方案，所提方法可分别将隐写分析错误率（P

值）平均提升8.7%、9.2% 、6.2%（所有嵌入率与隐写分析特征情况平均值）。所提方法适用于NFT图像，为除自然图像与生成图像以外的第3类载体（即NFT图像）提供了针对性的隐写方法。待 NFT 图像数量较为可观后，可充分利用神经网络强大的拟合与学习能力，设计深度学习的 NFT图像隐写方法。

Abstract

The images with non-fungible token (NFT) are employed as the digital artistic works in metaverse for creation

transaction

sharing

and collection.Being different from natural images

the content of NFT images is defined by user and distributed in the digital space widely.It is convenient for the hidden of secret data.In this case

covert communication with NFT images is a new branch of image steganography.Then

a steganographic method for NFT images was propose

d accordingly.Given a NFT image

the regions of its profile and the components with high frequency were enhanced firstly to enrich the details which were beneficial to hide the modification trace of steganography.In this way

the enhanced image was used as cover since it is more suitable for steganography.Then

the tendency modification direction of each pixel was determined by the differences between the enhanced image and the given image.The differences were also used to determine the cost value of modification amplitude.Thus

the undetectability of steganography can be increased further.Secret data was embedded into the cover image using the popular steganographic coding schemes.Experimental results showed that the proposed method had imporoved undetectability on NFT images compared with existing digital steganographic schemes.Compared with HILL

MiPOD

and DEFI

the proposed method can increase the detection error P

of steganalysis by 8.7%

9.2% and 6.2%

respectively (the average value for the cases of different payload and steganalytic features).Therefore

the proposed method is suitable for NFT images and it provides targeted steganographic method for the third kind of images

i.e.

NFT images

except of natural images and generated images.For further study

the deep learning-based steganographic method can be designed for NFT images using the strong fitting and learning ability of neural networks.

关键词

Keywords

references

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