A text hiding method using multiple-base notational system with high embedding capacity

Techniques used in text steganography are more difficult to develop, since there is less redundancy in text than other media, such as image, video and audio. A text hiding method using multiple-base encoding is proposed. The occurrence number of each word is counted and sorted in descending order, which is set as a base in the multiple-base notation system. Those unrepeated words are treated as a whole, the number of which is set as a base too. The secret message to be hided is transformed into an expression of multiple-base notation system. Spaces are added after some positions of the repeated words. Experiments and analysis show that the proposed method possesses better performance over the similar method proposed before.