Watermarking is one of the best solutions for copyright protection and authentication of multimedia contents. In this paper a hybrid scheme is proposed using wavelet and shearlet transforms with singular value decomposition. For better security, Arnold map is used for encryption. Examining the results and comparing with other methods show that this hybrid proposed scheme with simultaneous utili...

The chaos-based image cryptosystems have been widely investigated in recent years to provide real-time encryption and transmission. In this paper, a novel color image encryption algorithm by using coupled-map lattices (CML) and a fractional-order chaotic system is proposed to enhance the security and robustness of the encryption algorithms with a permutation-diffusion structure. To make the enc...

Image encryption is an active and challenging research area. This article proposes a transposing and scrambling image encryption algorithm based on improved hyper-chaotic sequence to provide enhanced security for encrypted image transmission. The algorithm processes the hyper-chaotic sequence according to the pixel information, which makes the keys be sensitive to original image. Then we apply ...