Security Approaches in Internet Communication

In today’s world, information security is an essential factor, which must be taken into consider to ensure secure applications and services in information technology. Since the inception of the information technology concept, there has been a remarkable interest in security approaches that aim to protect information or digital data. Especially, rise of the Internet and internet technologies has caused searching for newer approaches, methods and techniques that try to provide secure internet communication sessions for computer users over the Internet. In this sense, this chapter aims to examine security approaches in internet communication. For this purpose, role of the coding science: “cryptology” in providing secure internet communication and related techniques in this scope are also explained within the chapter. Furthermore, in order to give an example for usage of cryptology techniques, an e-mail application, which was developed to send or receive encrypted e-mail messages, is also introduced in this chapter.