Steganography in SMS by Sudoku puzzle
Sudoku puzzle is a logical game which has recently got very popular. Every day various mass media print these puzzles. As a result these puzzles are a suitable alternative for hidden data transfer. SMS (short message service) is one of the popular mobile-phone services. In this service people can write short messages and send it to each other through mobile phones. In this paper a method has been presented for steganography (hiding data) in Sudoku puzzles and through SMS. In this method after hiding data in a Sudoku puzzle, the puzzle is sent in a way that it does not attract any attention. Steganography algorithm is based on order of place of numbers 1 through 9 in one of the specified row or column of the puzzle. In this algorithm after solving the Sudoku puzzle, one extracts hidden data in accordance with order of numbers 1 through 9 in one of the certain row or column which is equivalent with hidden data.