FPGA implementation of image steganography using Haar DWT and modified LSB techniques

Security places an important role in communication applications for secure data transfers. Image Steganography is one of the most reliable technique in encryption and decryption of an image (hidden) inside other image (cover) such way that only cover image is visible. In this paper frequency domain Image Steganography using DWT and Modified LSB technique is proposed. The proposed approach uses DWT to convert spatial domain information to frequency domain information. The LL band is used for further Image Steganographic process. The image is decoded using inverse LSB. Since the LL band is used for encoding and decoding purpose, memory requirement of the design is less for hardware implementation. Also this will increase the operating frequency of the architecture. The proposed technique obtains high PSNR for both stegano and recovered hidden image.

I. Introduction

Security is an important issue in various field such as communication and storage of confidential data in present era. A variety of encryption scheme have been proposed to ensure security of data like cryptography, steganography etc. Image encryption has wide applications [1] such as internet communication, multimedia systems, medical imaging, telemedicine, military communication, etc.