Abstract: In this paper, we propose an efficient text steganography scheme using Unicode characters which hides the secret data into the Microsoft word document. It hides the secret data into inter-word, inter-sentence, end of line and inter-paragraph spacings. Firstly, the scheme selects Unicode space characters which don't give any awkward presence on visual attacks and then, it combines the selected characters with regular space characters to map the secret data bits to each combination. It normalizes the width of the Unicode character which has larger width by reducing their font size so that their width equals the width of hair or Six-Per-Em Unicode characters. This in turn, increases hiding capacity as the number Unicode spaces which can be embedded into the end of line and inter-paragraph spacings are increased. From the experimental results, it is evident that our scheme achieves higher hiding capacity, better hiding efficiency as well as higher visual imperceptibility in comparison to other existing schemes.
Rajeev et al. REF discuss an efficient text steganographic scheme using Unicode characters which hides the secret data into the Microsoft word document.
An efficient text steganography sheme using Unicode Space Characters