e-Commerce Applications Using Oracle8i and Java from Scratch

Understanding Firewalls

Most companies that use e-commerce implement an Internet firewall. A firewall is essentially a system that enforces a security policy for data transfer between the company and the Internet. In order for a firewall to be effective, it is important that all data transfer between the company and the Internet occurs through the firewall. The firewall intercepts, scrutinizes, and verifies each and every network packet that passes through it. It is important to understand that the firewall is not a substitute for other security measures. In fact, the firewall should be part of a comprehensive security strategy that includes physical protection as well as user awareness of the need to protect passwords and so on. Firewalls must ...