  In the era of Information Technology, cyber-crime has always been a worrying
issue for online users. Phishing, social engineering, and third party attacks
have made people reluctant to share their personal information, even with
trusted entities. Messages that are sent via Short Message Service (SMS) are
easily copied and hacked by using special software. To enforce the security of
sending messages through mobile phones, one solution is SMS steganography. SMS
Steganography is a technique that hides a secret message in the SMS. We propose
a new approach for SMS steganography that uses a mathematical equation as the
stego media in order to transmit the data. With this approach, we can hide up
to 35 characters (25%) of a secret message on a single SMS with maximum of 140
characters.
