Separable and error-free reversible data hiding in encrypted images

Separable and error-free reversible data hiding in encrypted images
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可分离且无错误的可逆数据隐藏在加密图像中

DOI:
10.1016/j.sigpro.2015.12.012
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发表时间:
2016-06
期刊:
影响因子:
4.4
通讯作者:
Rangding Wang
Rangding Wang
中科院分区:
工程技术2区
文献类型:
--
作者:
Dawen Xu;Rangding Wang

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数字图像有时需要以加密格式存储和处理以保持安全性和隐私性,例如,云存储和云计算。出于内容标记和/或篡改检测的目的,云服务器需要在这些加密图像中直接嵌入一些附加信息。作为一种新兴的技术,在加密域中的可逆数据隐藏由于其能够保持机密性而在云计算中将是有用的。本文提出了一种新的可分离、无差错的可逆图像数据隐藏方案。在分析插值技术特点的基础上,采用流密码对采样点进行加密,并设计了一种特定的加密模式对非采样点的插值误差进行加密。然后,数据隐藏者,谁不知道原始图像的内容,可以可逆地嵌入秘密数据到插值误差使用修改版本的直方图移位和差异扩展技术。为了适应不同的应用场景,可以在加密域或解密域中进行数据提取。此外,实现了真实的可逆性,即数据提取和图像恢复没有任何错误。实验结果证明了该方案的可行性和有效性。
Digital image sometimes needs to be stored and processed in an encrypted format to maintain security and privacy, e.g., cloud storage and cloud computing. For the purpose of content notation and/or tampering detection, the cloud servers need to embed some additional information directly in these encrypted images. As an emerging technology, reversible data hiding in the encrypted domain will be useful in cloud computing due to its ability to preserve the confidentiality. In this paper, a novel separable and error-free reversible data hiding scheme in encrypted images is proposed. After analyzing the property of interpolation technology, a stream cipher is utilized to encrypt sample pixels and a specific encryption mode is designed to encrypt interpolation-error of non-sample pixels. Then, the data-hider, who does not know the original image content, may reversibly embed secret data into interpolation-error using a modified version of histogram shifting and difference expansion technique. In order to adapt to different application scenarios, data extraction can be done either in the encrypted domain or in the decrypted domain. In addition, real reversibility is realized, that is, data extraction and image recovery are free of any error. Experimental results demonstrate the feasibility and efficiency of the proposed scheme.
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