This chapter covers the basic concept and practice of the following topics in cryptography:
The topic of “VoIP security” includes many aspects. One of the key aspects is the methodology of information hiding; that is, how to conceal the signals and media in real-time communications from unauthorized entities. Cryptography is the main solution for this aspect.
The purpose of this chapter is to give a high-level understanding of each technique with comprehensible figures, rather than looking into the mathematical detail of cryptographic algorithms.
As an introduction, ...