Cryptography of Images Using Diffie Hellman Algorithm

Abstract

The Digital data is widely transferred over the internet due to which it may get effected by the intervention
of intruders, data tampering, unauthorized access etc. Thus to fulfill the need of data security the cryptography comes to
the existence and accepted worldwide. Cryptography is a mechanism to encrypt the data in non-readable format by using
a key which is only known to the sender and receiver of the information. This study develops a new encryption based
cryptography approach for securing the information of the images. The proposed approach is a combination of two
prominent security methods i.e. Diffie Hellman key generation mechanism, Huffman Encoding technique and XOR
operation is also used to compressed data and diffie permuted key to achieve the encrypted file. This mechanism provides
two-level security to the images by firstly compressing the image and then encrypting it by using XOR operation. In order
to approve the proficiency of the work the present technique is compared with the chaotic-ANN encryption technique in
terms of NCPR, UACI, correlation, PSNR, MSE and Entropy. The evaluated NCPR of present method is 100, UACI
is52.526 and Entropy is 7.9948.