Abstract

Security of image information has always been important in the field of data. By using image encryption algorithms, the sender encrypts the plaintext into the Cipher-text. Only the authorized receiver could decrypt the Cipher-text with the secret key to obtain the plaintext. The encryption methods mainly include seven types. Among the reported approaches, the chaos-based ones suggest a promising direction owing to their optimal trade-off between security and efficiency. The existing approach presents a new chaos-based image cipher using a plaintext-related permutation. The cat map and Lorenz system are employed to shuffle the positions of image pixels and generate the diffusion key stream, respectively. The control parameters of the cat map, i.e. the permutation key, are determined by the murmur2 hash value of the original image. The entire process of encryption is carried out in the spatial domain. The attacker can hack acquire the information from the encrypted image easily. To overcome the drawbacks with the existing approach proposed a new image framework based on the Discrete Wavelet Transform, Arnold Transform. Here the proposed approach accomplished the DWT which represents the image in the frequency domain by which the attacker can’t acquire the information easily.