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Paper details
Number 4 - December 2019
Volume 29 - 2019
Improved reference image encryption methods based on 2k correction in the integer wavelet domain
Turker Tuncer, Sengul Dogan, Ryszard Tadeusiewicz, Paweł Pławiak
Abstract
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.
Keywords
visually meaningful image encryption, 2k correction, discrete wavelet transform, least significant bits embedding