Table of Contents
Network Security
Security Aspects
Security Threats
Secret Key Encryption
Public Key Encryption
Public Key Encryption: Example
Digital Signature
Confidentiality
Simple Firewall: Packet Filter
Filter Table: Example
Bastion Host
Screened Subnet Architecture
Multiple Bastion Hosts
Merged Interior and Exterior Routers
Merged Bastion Host and Exterior Router
Dual-Homed Host Architecture
Merged Bastion Host and Interior Router (Not Recommended)
Proxy Servers
What Firewalls Can't Do
Security Mechanisms on The Internet
Pretty Good Privacy (PGP)
Summary
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