Category: Security


SSL – Secure Socket Layer

Introduction This article is a gentle introduction to problematics of secure electronic communication. Whoever wants to communicate on the Internet in a secure manner can generally choose one of two technologies. One of them is …

How Firewall Works

Firewall theory Introduction Firewalls Protocols Paket structure Request and Response Filtering by address ICMP TCP and UDP Filtering by port Network interfaces Bad packets Conclusion Introduction Gone are the days when we could live our …