Analysis of Image Encryption using Chaotic, Hybrid Chaotic and Block Cipher Approach
Date
2018
Authors
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Publisher
Department of Computer Science and Information Technology
Abstract
Secured image transmission in the network is the biggest threat to the real world because of
increasing network security problem, illegal and unauthorized access, malicious code and
intruders. The security to the image is given by image encryption techniques. Image encryption is
the process of changing the original image into a scramble, unrecognized form. There are various
techniques and method for image encryption. In this study chaos based image encryption and block
cipher technique are implemented and analyzed for the encryption. Arnold catmap and Arnold
catmap with logistic map are used as native chaotic and hybrid chaotic approach respectively
whereas AES is used as block cipher approach. The chaotic algorithms encrypt the image by
shuffling and scrambling the pixel value of the image which is also called as confusion and
diffusion process. The block cipher algorithm encrypt the image by extract the block of 128 bits
pixel data from the image with the key of 128 bits. The chaotic and block cipher methods are
applied to encrypt image and subjected to measures the different performance parameters like
PSNR, NPCR, UACI, Histogram, encryption/ decryption time to measure the strength of the
algorithms. The results show the Arnold catmap with logistic map has better NPCR and UACI
value which makes it more robust method to defend differential attack or chosen plain text attack
it is also computationally efficient since less time is taken for encryption/decryption process. AES
has less PSNR value which helps to preserve image properties after decryption and the histogram
of original and cipher image more variation in AES than other two approach so it is able to defend
statistical attack or cipher text only attacks.
Description
Keywords
Image encryption, Chaos theory, Block cipher, Logistic map