A new multi-layer RGB image encryption algorithm based on Diffie-Hellman cryptography associated with FrDCT and arnold transform

Abstract

To protect sensitive data from unauthorized access is a prime agenda nowadays. Cryptography helps us to achieve this goal. An image encryption algorithm for the secure transmission of image data over a public communication channel is proposed. The encryption algorithm uses encryption scheme based on Diffie-Hellman key agreement protocol, fractional discrete cosine transform and Arnold transform. The earlier developed encryption algorithms, pixel values are not disturbed. They are only shifted to other coordinate positions. However, in our approach, pixel values are both disturbed and moved to different coordinate locations. The proposed scheme is secure in both time and frequency domain and gives multi-layer security for RGB image data. In contrast to similar schemes available in the literature, the security of our proposed technique depends upon shared secret keys, and their proper arrangements. The proposed encryption algorithm is susceptible to secret keys. A complete simulation analysis is provided to verify the validity of the algorithm.