Through following this course, students will gain a basic understanding of the principles behind network security and the working of the main protocols, mechanisms and techniques in the area of security. The course consists of three parts: security mechanisms within network protocols, systems security and lab sessions. In the first part (security mechanisms within network protocols), the following topics will be discussed: IPSec, SSH, SSL, HTTPS and security for wireless networks. The second part (systems security) discusses topics like scans, intrusions, DOS attacks and firewalls. The last part (lab sessions) will have the students perform practical experiments. Some examples of possible practical experiments are listed below: Remote system fingerprinting (such as possible with tools like nmap); Break anonymization (such as on network traces); Break in into dedicated and prepared web-servers, using tools like Cross-site scripting and SQL injection