Study Of Information Hiding Based On DWT

Information hiding refers to the technology of embedding some information to digital media. The embedded information convey addition information and maintaining the sense effect of the media. There are two functions of information hiding. One is to prove validity as it conveys addition information about the carrier for its copyright, ownership, distribution etc. Another, Steganography is to conceal the existence of communication by cover carriers.1,The states, basic model, characteristics, classification and applications of the digital watermarking and steganalysis of techniques are introduced.2,Presents a new watermarking coded algorithm based on reduced frequency based on algorithm that embed watermarking by compare frequency domain coefficients. It makes watermark better invisible , good robustness to JPEG compression and robust to many attacks.3,A image steganalysis method for JPEG pictures is proposed, in which features form spatical and DWT domains are selected to form a classifying model. Experiments show that this method could detect the hidden information efficiently.