Wavelet Based Image-Text Fusion Algorithm for encrypted message transmission

Abstract

The demand for secure communication over the link has augmented the need for robust algorithms. In order to ensure confidentiality, authenticity and integrity of the messages transmitted, the algorithms must facilitate high efficacy. In this paper, we have implemented a method for sharing secret messages encrypting them in gray-scale images, that are processed with Discrete Wavelet Transform (DWT). The algorithm incorporates a novel sub-band elimination technique to exploit the basic properties of DWT and embed a text message in the eliminated sub-band. The process of band elimination is governed by determining the energy contribution of each band. The proposed technique ensures that the text message is received only by an authenticated receiver possessing the access key. This technique is found to provide a reliable exchange of information, as well as acceptable compression ratios. This paper further illustrates a detailed analysis of the algorithm.