  Steganography is the art and science of writing hidden messages in such a way
that no one apart from the intended recipient knows of the existence of the
message. In today's world, it is widely used in order to secure the
information. In this paper, the traditional spectral estimation methods are
introduced. The performance analysis of each method is examined by comparing
all of the spectral estimation methods. Finally, from utilizing those
performance analyses, a brief pros and cons of the spectral estimation methods
are given. Also we give a steganography demo by hiding information into a sound
signal and manage to pull out the information (i.e, the true frequency of the
information signal) from the sound by means of the spectral estimation methods.
