Block Based Information Hiding using Cosine, Hartley, Walsh and Haar Wavelets

Steganography is the art of hiding informationwithin other information in such a way that it ishard or even impossible to tell that it is there. Thereare many different carriers for steganography butthe most popular is digital images. Typically, themessage is embedded within another image knownas a cover image, by tweaking its properties. Theresulting output, known as astego-image isengineered such that it is a near identicalperceptual model of the cover image, but it will alsocontain the hiddenmessage.It is this stego-imagethat is sent between the sender and the receiver.Steganography is a science for invisiblecommunication and play vital role on the networksecurity.To improve the embedding capacity as wellas to have minimum distortion tocarrier media, we