Voice over IP Security

This chapter covers the basic concept and practice of the following topics in cryptography:

•   Symmetric (Private) Key Cryptography

—   DES

—   3DES

—   AES

•   Asymmetric (Public) Key Cryptography

—   RSA

—   Digital Signature (DSA)

•    Hashing

—   MD5

—   SHA

—   Message Authentication Code (MAC)

•   Key Management

CHAPTER 4Cryptography

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.

NOTE       The purpose of this chapter is to give a high-level understanding of each technique with comprehensible figures, rather than looking ...