Abstract: Steganography is the science of hiding data within a cover object in order to keep the secret message invisible without affecting the integrity of the cover object, so the other individuals fail to recognize the presence of the secret message. This study concerns with the steganography in the MS Excel documents. We propose a new steganography method to hide data in the Excel sheets by changing both the font color and font type of each character of the text within each cell. The proposed method will hide two information bits -that belong to two successive characters within the secret message- in one character within a Excel cell by using both font color and font type. The first bit will be conceal by using two different values for the same color (for example: for Red color, two values can be used, 255 to conceal the bit "1" and the value 254 to conceal the bit "0") and the second bit will be conceal by using the font types that have two different values but the same appearance (for example: the font type "Arial" is used to represent the information bit "1" and the font type "Microsoft Sans Serif" is used to represent the information bit "0"). Using these two font attributes make all the text with the color "red" and with the same appearance but the value of the red color in each cell is really different and so the font type. Also the proposed approach distributes all the bits of secret message randomly all over the Excel sheet depending on a geometric manner making it difficult to extract the secret message back.
Samraa A. Al-Asadi and Wesam Bhaya, 2016. Text Steganography in Excel Documents Using Color and Type of Fonts. Research Journal of Applied Sciences, 11: 1054-1059.