Data Hiding and Retrieval

Abstract

The word steganography is a Greek word means “covered or hidden writing”. Steganograpahy is a special method of writing hidden messages in such a way that no-one apart from the sender and the receiver can realizes that there is a hidden message. The Steganography includes the embedding of digital information within computer files. In our present work we try to embed sound file in an image file, text file within a word file or within a excel file or within a pdf file. In fact we try to embed any file into another cover file. The only restriction is that the size of cover file must be at least 10-20 times bigger than the embedded file. In the present work we apply (i) changing LSB, (ii) changing LSB+1 bit, (iii) changing LSB+3 bit for inserting secret message inside a cover file. We have also introduced the password for getting into the secret file. If the password is incorrect then we will not be able to extract message from the cover file.