Abstract
This paper sets the main focus on the evaluation of transparency, robustness and capacity of the embedding function of Substitution Techniques of digital audio steganography algorithms. Lots of steganography techniques have been described in this literature. Here, beside the evaluation of embedding parameters for the existing techniques, two problems -weaknesses- of Substitution Techniques are investigated which if they could be solved, the large capacity - strength- of Substitution Techniques would be practical.