期刊名称：International Journal of Applied Mathematics and Computer Science
电子版ISSN：2083-8492
出版年度：2019
卷号：29
期号：4
页码：1-13
DOI：10.2478/amcs-2019-0060
出版社：De Gruyter Open
摘要：Many visually meaningful image encryption (VMIE) methods have been proposed in the literature using reference encryption.
However, the most important problems of these methods are low visual quality and blindness. Owing to the low
visual quality, the pre-encrypted image can be analyzed simply from the reference image and, in order to decrypt nonblind
methods, users should use original reference images. In this paper, two novel reference image encryption methods based
on the integer DWT (discrete wavelet transform) using 2k correction are proposed. These methods are blind and have high
visual quality, as well as short execution times. The main aim of the proposed methods is to solve the problem of the
three VMIE methods existing in the literature. The proposed methods mainly consist of the integer DWT, pre-encrypted
image embedding by kLSBs (k least significant bits) and 2k correction. In the decryption phase, the integer DWT and preencrypted
image extraction with the mod operator are used. Peak signal-to-noise ratio (PSNR) measures the performances
of the proposed methods. Experimental results clearly illustrate that the proposed methods improve the visual quality of
the reference image encryption methods. Overall, 2k correction and kLSBs provide high visual quality and blindness.
