Denial-of-Service & Distributed Denial-of-Service on the Internet

Denial-of-Service and Distributed Denial-of-Service is costing the economy world-wide billions of dollars. The economy is the cornerstone of the society and its collapse will certainly change the way in which humanity exists today. The three main goals of computer security are availability, confidentiality and integrity. The focus of this paper is on attacks that compromise the availability of systems. A Denial-of-Service attack is a very serious threat to the infrastructure of the Internet, as well as its users. The Internet plays an important role in one's everyday lives and many companies are dependent on it to conduct business or provide critical real-time services and cannot function when computer systems and network access go down.