A space based reversible high capacity text steganography scheme using font type and style

In this paper, we propose a space character based reversible high capacity text steganography scheme which embeds the secret data into a Microsoft Word document. The scheme hides the secret data bits into the white spaces by changing their font type and style. Since the white spaces are invisible characters, the changes made in their style as well as in their font type do not raise suspicion. Thus, the changes made in the cover text are invisible which counter the visual attacks. We don't add extra space or characters to embed the secret data which helps in increasing hiding efficiency. Our scheme is also more robust as well as has higher hiding capacity in comparison to the other existing schemes.