An Architecture Platform for Grey Level Modification Steganography System Muhammad A Khan, Vidyasagar Potdar, Elizabeth Chang Curtin University of Technology, Perth, Western Australia {KhanM, PotdarV, ChangE}@cbs.curtin.edu.au Abstract The secret information exchange method is an alternative approach for information protection using 3 rd party trustees such as CIA. This approach provides                     rey level modification steganography is an approach where words are mapped to image pixels. The selected pixels values are selected from an image using a mathematical algorithm. In this paper, we present an architecture platform for a new grey level modification steganography algorithm, a secret hiding technique and a prototype system. We validate the secrecy of the technique and explain the results, finally we outline the capacity of the platform and its capability of information embedding and hiding. Keywords: Architecture platforms, Grey level modification, Steganography, Secret information hiding,, embedding, de-bedding. 1.0 Introduction Information protection is not only important to the high tech industry which needs to make their system ultra secure but also for corporations, governments and industry systems. This gives them the winning edge, sustainable competitive advantage and assist in overcoming vulnerability. To protect secrecy, we need to discover new and better cover mediums as well as design and develop robust algorithms. Steganography is also known as ‘covered writing’ and includes methods of transmitting secret messages through innocuous cover mediums in such a manner that the existence of the embedded message is undetectable. Carriers include innocent images, audio, video, text, or any other digitally represented code. The hidden message may be plaintext, cipher text, or anything that can be represented as a bit stream. We use steganography to achieve the goal of disguising the existence of secret communication. If the existence of communication is deciphered then this goal is defeated. In this paper, we provide a new Architecture platform for grey level modification steganography system, which embeds binary data within the spatial domain of the grey scale images by modifying the grey level values of the pixels. This paper is organized as follows: in section 2 we provide a brief overview of GLM Steganography: in section 3 we present a formal definition of GLM; in section 4 we provide logical view of GLM embedding system: in section 5 we provide logical view of GLM and De-bedding system: in section 6 we provide architecture design of GLM steganography platform: in section 7 a detailed design of GLM platform: in section 8 implementation of embedding: in section 9 implementation of de-bedding: and in section 10 we finally discuss some issues. 2.0 Overview of Grey Level Modification (GLM) Steganography In this section, we briefly outline the GLMS technique. The technique was published in [1]. Grey scale images were used. The grey level modification algorithm (GLMA) was designed with the purpose of information hiding rather than image processing. The information that has to be hidden has to be in binary format. GLM steganography uses the concept of odd and even numbers to map data within an image. It is a one-to-one mapping between the binary data (i.e. a bit stream with 1s and 0s) and the selected pixels in an image as shown in Figure.1. From a given image a set of pixels are selected based on a mathematical function. The grey level values of those pixels are examined and compared with