DefinePK

Abstract

Hiding secret information in a cover, which is of same type or different type is called Steganography. The main goal of the Steganography is that the sharing of secret information should not be shown to the intermediaries during communication. Several algorithms have been developed having different kinds of cover media, such as text, image, audio or video. We propose an approach to convert a secret message, which is available as Tamil text document into a gray-scale image that can be created of any size based on the size of the secret message by the sender, and that is transmitted over communication channel. At the hiding end, the characters in the Tamil text document are encoded after encryption, then the image is scanned row by row, and in each non black pixel four characters are hidden. Only if the color of a pixel is not black, then the characters are hidden into it. At the extraction end, the characters are extracted after finding that the pixel is not in black color. This proposed method shows an agreeable experimental result with the cover image chosen. The efficiency of this proposed method is that the size of the stego image is lesser than the size of the secret message. Security can be increased by encrypting the secret text before embedding into the cover image.