Reversible Steganographic Technique Based on IWT for Enhanced Security

Steganography is used to hide a secret message within a cover image, thereby yielding a stego image such that even the trace of the presence of secret information is wiped out. The purpose of steganography is to maintain secret communication between two users. Steganography has several technical challenges namely high hiding capacity and imperceptibility. Steganographic technique with Integer Wavelet transform (IWT) and reversible technique provides high hiding capacity, high security, low complexity and good visual quality. Reversible technique in the sense extraction of the original input image. Steganography technique is of different types such as image steganography where image file is used as cover file, audio steganography where audio file is used as cover file and video file where video is used as cover file. Image steganography is the best technique for hiding information with more security than the other techniques.