Introduction
The Internet has greatly transformed our everyday lives and is an integral part of our national security. Nowadays communications systems are the mainstay for much of the national infrastructure. The communications sector creates the foundation for vital informational exchange, including audio, video and data connectivity, but with greater openness, interconnection and dependency comes greater vulnerability. The United States of America, just like any other modern and developed country, is very dependent on information infrastructure. Moreover this relation is constantly strengthening. Computer-based systems frequently face cyber attacks, which vary from pure innocent curiosity to critical intrusions. The consequences of these ...