High security image steganography using RSA algorithm

Digital steganography exploits the use of a host data to hide a piece of information in such a way it is imperceptible to a human observer. In this paper, secrete message is first encrypted by using cryptography algorithm. This encrypted message hiding (embedding) is realized in bit planes of subband. Wavelets coefficients are obtained by using the Integer Wavelet Transform (IWT). To increase data hiding capacity while keeping the imperceptibility of the hidden data, the replaceable IWT coefficient areas are defined by a complexity measure used in the Bit-Plane Complexity Segmentation Steganography (BPCS). The proposed system shows a high capacity and secure image steganography.