Digital Image Steganography using Dithering Technique

Steganography refers to the science of "invisible" communication. Unlike cryptography, where the goal is to secure communications from an eavesdropper, steganographic techniques strive to hide the very presence of the message itself from an observer. The general idea of hiding some information in digital content has a wider class of applications that go beyond steganography. Here we propose a new innovative technique for hiding and then retrieving a secret image. The technique consists of two processes viz. encoding and decoding. Main focus in the encoding phase is to hide the secret RGB colour image in a cover image and get some shares which are to be transmitted to the receiver. In the decoding phase, main focus is to get back the retrieved image back to the original image quality as much as possible from the shares in the received end. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of C3IT