PROMOTING ACCESS TO AFRICAN RESEARCH

Journal of Computer Science and Its Application

Log in or Register to get access to full text downloads.

Remember me or Register



DOWNLOAD FULL TEXT Open Access  DOWNLOAD FULL TEXT Subscription or Fee Access

An efficient image cryptosystem based on wolfram sequence and RNS

S. Alhassan, K.A. Gbolagade

Abstract


In this paper we propose a novel encryption algorithm for digital images using the moduli set {2n+2, 2n+1, 2n}. The technique uses the Wolfram sequence for resizing, bitwise-XOR for pixel scrambling and modulus operation for pixel encoding. In the proposed scheme, a digital image is first segmented into many parts. A quarter (the upper most left part) of the segmented image is used to perform the scrambling and the modulus processes. Experimental results reveal that the proposed scheme can effectively encrypt/decrypt images with good compression ratio and a very minimal distortion. Simulation analyses also show that the scheme has a large key space, high information entropy, low correlation coefficient, highly sensitive to change in secret keys and efficient in both bit representation and internal memory requirement

Keywords: Moduli set, XOR operation, pixel scrambling, Wolfram sequence, encryption algorithm.




AJOL African Journals Online