New Metrics for Steganography Algorithm Quality
Steganography is used to invisible secret communication between parties by hiding the existence of the secret information changing inside other media. Many techniques and approaches are proposed by the researchers. There is a necessity to use some metrics and tests to check the quality of these algorithms and approaches. Now, many tests were used to check this quality such as Mean Square Error, Peak Signal to Noise Ratio, Cross Correlation coefficient, Entropy, and the signal-to-noise ratio. These tests are taken in the consideration the number of bits that were changed in cover through the hidden process and check the quality of the stego-cover. But these tests don't take in the account the total amount of the secret data that will be hidden in the stego-cover or the locations of changed bits in the byte, or pixel, within the stego-cover. Therefore, there is a lack of precision in measuring the efficiency of the proposed algorithms. So, there is a need to use metric that meet these requirements in tests. The paper introduces two metrics to evaluate the steganography algorithms that take into account the total amount of hidden data and the number of bits affected in the stego cover by the hiding processes and their locations in the byte, or pixel.