Text Hiding in Mobile Phone Simple Message Service Using Fonts

Problem statement: Hiding secret information in an ordinary mobile phone Simple Message Service (SMS). Approach: In mobile phones, there are two default types of fonts, System and Proportional fonts, which have similar figures to human vision and cannot recognized by human eye. The suggested method hides the information (0,1) in cover SMS message by changing the fonts of each character by one of those two fonts (0 represented by System font and 1 represented by Proportional fonts). After embedding secret information in cover message, the Stego message will look like an ordinary message but each character draw in one of these similarity fonts. Finally, at extract site, it must analyze each character font to retrieve secret information. This study has been implemented by J2ME (Java 2 Micro Edition) programming language to works in mobile (cellular) phones. Results: By using two similarity fonts, we can hide one bit in one character of mobile phone message. Conclusion: Good steganography depends on the human behavior and way of thinking. The most successful hiding method is the uncommon one. Although the proposed method is simple but it is unthinkable one and needs knowledge and experience to be discovered.