Modified Graphstega Based on Chart Scale Modification

摘要

Recently, steganography is frequently used for providing covert channel. There are two types of steganography, noisy and noiseless. Noisy steganography approach hides the message by altering the bit of cover. The alteration process produce noise such that it will raise suspicion. Desoky and Younis proposed a noiseless steganography method namely Graphstega that conceal the message as plotted data point in a chart [1]. Graphstega has low suspicion level since the chart-cover was built based on the message such that there are possibilities where the data represented by the message is unrealistic. The unrealistic data will raise suspicion. The Modified Graphstega camouflaged the message into a chart that was built based on existing (realistic) data. For obtaining the message from the chart, Sudoku solution was used. Sudoku was used for securing the position of points which represented the message. The experiment result showed that Modified Graphstega Based on Chart Scale Modification had better performance in suspicion level, security level and robustness than Desoky's one.