Image Encryption Using Pseudorandom Permutation

Abstract

A simple, fast, and dynamic image encryption scheme is proposed in this paper based on pixel shuffling. The primary idea applied for the purpose lies in designing of dynamic pseudorandom permutation map using simple divide and conquer method that will introduce diffusion among strongly correlated image pixels. As a result, the visual information content is completely lost. Data encryption is to hide and conceal the information content present in the secret data. Data encryption differs from data hiding, where the prime objective is to conceal the secret data. Using the technique of reversible data encryption, we can get back the original data content out of the encrypted message, without loss of any original information. The decryption process can be applied only at the authentic receiver end. Thus, we can transfer the encrypted data through any communication channel because it has completely lost its resemblance to the original data. Though theoretically it is possible to break such security, it does not appear feasible by any known practical means as it appears as random noise to any unintended recipient. To incorporate second fold of security, some proper data hiding methods can be used to embed the encrypted data. In this paper, we have presented a new visual data encryption technique by randomly shuffling the pixels within the image. The newly formed encrypted image using this technique completely loses the original characteristics. Our experimental results show that the proposed method can achieve the claim.