Chapter 01: Introduction to Network Security

Network  A Network is the inter-connection of communications media, connectivity equipment, and electronic devices for the purpose of sharing data and resources. Security:  As the word security means safety or safekeeping or protection.

Introduction to Network Security Why do we have to protect or "Secure" the network? We need to protect the network because there are constant threats against the "resources" we share in the network. These could be valuable information or data about our employees and clients, or more importantly about our products or businesses. Most of these threats come in the form of:  Viruses, worms, and Trojan horses  Spyware and adware  Hacker attacks

Introduction to Network Security Network Security Systems are usually composed of many components of both software and hardware which are designed to work together to improve security and minimize maintenance. The software must be relentlessly updated to prevent from new threats. These components include: * Anti-virus and anti-spyware * Firewall, to block unauthorized access to your network * Intrusion prevention systems (IPS), to detect and block attacks * Virtual Private Networks (VPNs), to provide secure remote access

Introduction to Network Security Three main objective of Network Security:  Confidentiality  Data integrity  Availability

Introduction to Network Security Confidentiality: This term covers two related concepts:  Data confidentiality: Assures that private or confidential information is not made available or disclosed to unauthorized individuals.  Privacy: Assures that individuals control or influence what information related to them may be collected and stored and by whom and to whom that Information may be disclosed.

Introduction to Network Security Integrity: This term covers two related concepts:  Data integrity: Assures that information and programs are changed only in a specified and authorized manner.  System integrity: Assures that a system performs its intended function in perfect manner  A loss of integrity is the unauthorized modification or destruction of information Availability: Assures that systems work promptly and service is not denied to authorized users.