一种同态加密域图像可逆水印算法

发布时间：2018-05-09 03:35

本文选题：整数Haar-DWT + 同态加密　；参考：《计算机学报》2016年03期

【摘要】：可逆水印技术是一种能够在提取水印信息后无失真地恢复出原始载体内容的信息隐藏技术,在军事和医学等对载体内容保真度要求较高的领域中具有很好的应用前景.当原始载体内容涉及个人隐私时,载体所有者不希望其直接暴露在传输信道中.因此,该文提出了一种基于Haar-DWT(Haar-Discrete Wavelet Transform)的同态加密域中的图像可逆水印技术:(1)通过利用数据搬移及量化的方法,分别解决了Haar-DWT过程中可能遇到的负数问题和小数问题,实现了加密域的整数Haar-DWT;(2)在保证逆变换系数为整数的前提下,将水印嵌入到k层高频子带中,得到的密文结果与明文域处理的结果一一对应,很好地实现了同态加密域中基于Haar-DWT的图像可逆水印;(3)能够利用乘法逆元MIM(Multiple Inverse Method)的方法,完全移除扩展因子,大大降低了加密域中的数据扩展.实验结果表明该文算法具有较大的嵌入容量,嵌入率最高可达到0.25bpp,而对应的峰值信噪比平均可达39dB.据作者了解,该文提出的图像可逆水印算法在同态加密域尚属首创.
[Abstract]:Reversible watermarking technology is a kind of information hiding technology which can recover the original carrier content without distortion after extracting the watermark information. It has a good application prospect in military and medical fields which require high fidelity of carrier content. When the original carrier content is private, the carrier owner does not want it to be exposed directly to the transmission channel. Therefore, this paper proposes a reversible image watermarking technique: 1 in homomorphic encryption domain based on Haar-DWT(Haar-Discrete Wavelet transform. By using the method of data transfer and quantization, the negative number problem and the decimal problem that may be encountered in the Haar-DWT process are solved, respectively. In this paper, the integer Haar-DWT2 of encryption domain is realized. On the premise that the inverse transform coefficient is integer, the watermark is embedded into the k-layer high-frequency subband, and the result of ciphertext is one-to-one corresponding to the result of plaintext processing. The method of reversible image watermarking based on Haar-DWT in homomorphic encryption domain is well implemented. The method of multiplicative inverse MIM(Multiple Inverse method can completely remove the expansion factor and greatly reduce the data expansion in the encrypted domain. Experimental results show that the proposed algorithm has a large embedding capacity and the highest embedding rate can reach 0.25 bpp.The corresponding peak signal-to-noise ratio (PSNR) can reach 39 dB on average. According to the author's understanding, the image reversible watermarking algorithm proposed in this paper is the first in the homomorphic encryption domain.
【作者单位】：暨南大学信息科学技术学院;
【基金】：国家自然科学基金(61272414)资助~~
【分类号】：TP309.7

【相似文献】