Image Encryption using Curved Scrambling and Diffusion

In the recent world, designing of a secure cryptosystem is prime focused area for the researchers. This paper emphasizes on the image encryption/decryption technique using a key derived from a plain image. In the proposed algorithm, encryption key is derived by applying new curved scrambling method to the RGB layers of a plain image. In next step, a temporary cipher image is obtained by modulo arithmetic using encryption key. To enhance security level, execute additional diffusion method to reset the pixel values within the given block and finally generate a cipher image. The described algorithm achieves a larger key space, good statistical property and effective resistance to the brute force attack thus provides highly secure cryptosystem for the real world applications. Keyword Image encryption and decryption, curved scrambling, diffusion, security