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A multi-layer Arabic Text Steganographic Method based on Letter Shaping
A.F. Al Azzawi
Department of Software Engineering, Philadelphia University, Amman, Jordan
Text documents are widely used, however, the text steganography is more difficult than other media because of a little redundant information. This paper presents a text steganography methodology appropriate for Arabic Unicode texts that do not use a normal sequential inserting process to overcome the security issues of the current approaches that are sensitive to steg-analysis. The Arabic Unicode text is kept within main unshaped letters, and the proposed method is used text file as cover text to hide a bit in each letter by reshaping the letters according to its position (beginning, middle, end of the word, or standalone), this hiding process is accomplished through multi-embedding layer where each layer contains all words with the same Tag detected using the POS tagger, and the embedding layers are selected randomly using the stego key to improve the security issues. The experimental result shows that the purposed method satisfied the hiding capacity requirements, improve security, and imperceptibility is better than currently developed approaches.
Arabic text, multi-layers, Unicode, hiding information, text steganography
The image is the most well-liked carrier media for steganography due to its abundance out there on the web. Another excuse is that the images have an excellent quantity of a redundant area that is the perfect place to embed data. However, text steganography isn’t commonly most popular because of the issue find a redundant area to embed bits in text files [1, 2]. The text document structure is often terribly the same as what’s seen, whereas, in all alternative cover media varieties, the structure is completely different than what we tend to observe, creating the concealment of data straightforward with none notable alteration. The advantage to favoring text steganography over alternative steganography media since it is less memory occupation and easier in communication 
The text is one among the oldest media applied in steganography; before the electronic age, telegrams, letters, and books hid secret information among their texts. Text steganography refers to the concealing of data among the text  and will involve something from changing the format of the text to changing words among a text to generating arbitrary character series or utilizing of context-free grammars to come up with clear interesting texts . Compared to the alternative media, text steganography needs a sound algorithm that may work below the constraint of low hiding capability, and the goal of this work is to make a secure high capability text steganography system for the Arabic language.
Figure 4. Arabic text shaping