An algorithm for encryption of secret images into meaningful images

Improved Reference Image Encryption Methods Based on 2 K Correction in the Integer Wavelet Domain

“…Reference image encryption methods are similar to data hiding methods. Therefore, visual quality is used for evaluating these methods because imperceptibility is very important for reference image encryption methods (Ghebleh et al, 2014;Dhall et al, 2018;Bao and Zhou, 2015;Kanso and Ghebleh, 2017;Avci et al, 2016).…”

“…Noise-like, texture-like and visually meaningful encrypted images are shown in Fig. 1 (Dhall et al, 2018;Bao and Zhou, 2015;Kanso and Ghebleh, 2017;Yang et al, 2018).…”

“…The wavelet transform has been widely used to transform images and there are integer versions of the wavelets. Therefore, lossless encryption methods have been proposed using integer wavelet transformations, which also provides robustness (Bao and Zhou, 2015;Kanso and Ghebleh, 2017;Yang et al, 2018). Hence, the wavelet transformation is used for reference image encryption.…”

“…Three important VMIE methods were proposed in the literature. These are the Bao and Zhou (BZ) (Bao and Zhou, 2015), Yang et al (Yang et al, 2018) as well as Kanso and Ghebleh (KG) (Kanso and Ghebleh, 2017) methods. The main problems involved in these methods are as follows:…”

“…Thus, this method has non-blind reference image decryption. • The KG method (Kanso and Ghebleh, 2017) is a reference image encryption method using data hiding. However, an optimum visual quality value is not obtained in this method because the authors embedded 3, 3 and 2 bits into LH, HL and HH sub-bands respectively.…”