TAILIEUCHUNG - Lecture Business data communications: Chapter 14 - Behrouz A. Forouzan

Chapter 14 - Network security: Firewalls and VPNs. In this chapter, we look at four issues of security: privacy, authentication, integrity, and nonrepudiation. We show how the first can be achieved through secret-key or private-key encryption. We discuss a concept called digital signature that satisfies the three other conditions. We talk about how security is implemented in the Internet. | Chapter 14 Network Security: Firewalls and VPNs List and distinguish between the four conditions of security. Understand how privacy can be achieved through encryption/ decryption. Understand the digital signature concept and how it can be used to provide authentication, integrity, and nonrepudiation. Understanding firewalls and their use in isolating an organization from intruders. After reading this chapter, the reader should be able to: OBJECTIVES OBJECTIVES (continued) Understand the different access control methods. Be familiar with VPN technology and how it provides privacy. INTRODUCTION Figure 14-1 Aspects of security PRIVACY Figure 14-2 Secret-key encryption In secret-key encryption, the same key is used by the sender (for encryption) and the receiver (for decryption). The key is shared. Note: Business Focus: DES One common method of secret-key encryption is the data encryption standard (DES). DES was designed by IBM and adopted by the . government as the .

• Quản trị mạng
• Business data communications
• Data communications
• Business data communications
• Network security
• Digital signature
• Security in the internet
• Data link layer
• Network criteria
• Data communications system
• Data communications networks
• Media access control
• Network models
• Network standards
• Application layer
• Application architectures
• Physical layer
• Digital transmission
• Network and transport layers
• Transport layers
• Local area networks
• Traditional ethernet
• Wireless local area networks
• Wireless LANs
• Backbone networks
• Backbone network architectures
• Circuit switched networks
• Wide area networks
• Risk assessment
• Network design
• Traditional network design
• Network management
• Configuration management