Abstract This paper funds a novel text-based steganographic algorithm with enhanced functionality with respect to the previously proposed methods, by careful selection of one of standard space characters, the introduced Inter-Letter Steganographic Method, or Visual and Reverse Extraction attacks, two additional modes of operation have been added to the original InLetSteg algorithm and have been merged into a single one, called as Unified Inter-Letter Steganographic Method, or UILS. The Unified Inter-Letter Steganographic Method (UILS) embeds the data using variable step-size into the host text and the developed mathematical model can calculate the approximate length of the host text required to embed certain data, statistically. In addition, the general mathematical model of UILS makes it customizable to adapt the real-world applications. The statistical parameters that are used through this work are calculated for English host text, but are easily calculable for other languages with similar alphabets and structure of notations. Finally, the programmatically deployed UILS outputs are experimentally examined using 60 attendant and the results are discussed.

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[24] Unicode Standard version 6.1, General Punctuation, Supplement Punctuation, Range 2E00-2E7F, Unicode Inc. Press, USA, 2011. Ahmad Esmaeilkhah was born in June, 1981. He received his B.Sc. in 2007, M.Sc. in 2013 in electrical engineering and his Ph.D. in 2019 in Telecommunication Engineering. He is now with University of Urmia. The main areas of his interest are Antenna, Scaling of Electromagnetic Structures, Radar and Steganography. Changiz Ghobadi was born in June, 1960 in Iran. He received his B.Sc. in Electrical Engineering Electronics and M.Sc. degrees in Electrical Engineering Telecommunication from Isfahan University of Technology, Isfahan, Iran and Ph.D. degree in Electrical- Telecommunication from University of Bath, Bath, UK in 1998. Now he is a Professor in the Department of Electrical Engineering of Urmia University, Urmia, Iran. Javad Nourinia received his B.Sc. in Electrical and Electronic Engineering from Shiraz University, M.Sc. degree in Electrical and Telecommunication Engineering from Iran University of Science and Technology, and Ph.D. degree in Electrical and Telecommunication from University of Science and Technology, Tehran Iran in 2000. Now he is a Professor in the Department of Electrical Engineering of Urmia University, Urmia, Iran. Maryam Majidzadeh was born in 1987 in Urmia, Iran. She received her B.Sc., in electrical engineering from Urmia University in 2009. As well, she received her M.Sc. and Ph.D. degrees in communication engineering from the same university in 2012, and 2016 respectively. She is now assistant professor in Department of Electrical and Computer Engineering, Urmia Girls Faculty, West Azerbaijan branch, Technical and Vocational University (TVU), Urmia, Iran.