SELECTIVE CHAOTIC GENERATION AND MULTI-MODALITY DIGITAL IMAGE CRYPTO SYSTEM USING HAAR WAVELETS

Abstract

The importance of secured image transmission plays a significant role in this information era. The hackers hack the medical data in the form of images that costs more in terms of claiming insurances.   It is necessary to secure the images that cannot be accessed by the unauthorized persons.  Among the many types of image crypto systems, the chaos based image crypto systems is best known for its key insensitive to attack or hacking.  The properties of the chaos play a major role in the generation of key for the secured transmission and reception. The Haar wavelet transform is yet simpler transform used to compress the input image in terms of approximate and detailed coefficients. The incorporation of the key in the approximate coefficients of the input image provides an efficient encryption when compared to other image crypto schemes. The encryption quality is evaluated using the histogram analysis of the encrypted of cipher image with different keys generated using respective chaotic maps. The framed image crypto system is designed and simulated using MATLAB software package.