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The technological age has forced the U.S. to engage a new set of national security challenges. Several potential adversaries have cyberspace capabilities comparable to those of the U.S., and are constantly conducting surveillance, gathering technical information, and mapping critical nodes that could be exploited in future conflicts. How can the U.S. government best defend against future cyber attacks? Recent policy documents set out a strategy for securing all of cyberspace, which experts argue is impossible to implement, but also unnecessary. This thesis seeks to move the discussion beyond this stalemate by undertaking an analysis of the vulnerability of cyberspace to terrorist attacks. The first analysis examines the Code Red Worm and the Slammer Worm. These two worms were selected because they were highly destructive and spread faster than normal worms, making them well suited for assessing the existing security of computers and networks. The next analysis examines a staged cyber attack on critical infrastructure, entitled Attack Aurora. In the staged Aurora attack, researchers from the Department of Energy’s Idaho lab hacked into a replica of a power plant’s control system. This attack is the most recent staged attack and facilitates an analysis of vulnerabilities of critical infrastructures to cyberterrorism.

This study analyzed the contents of three of the most popular Arabic‐language online message boards regarding the attacks of September 11, 2001 on the United States. Although terrorists claimed that the attacks were committed in the name of Islam, those who posted messages on all three forums rejected this claim. More than 43% of the messages condemned the attacks as a criminal act of terrorism that contradicts the core teachings of Islam. Some 30% saw some justification behind the attacks, even if they felt sorry for the victims and their families. However, those participants viewed the attacks as a political, rather than a religious, issue.

Brief analysis of how terrorists use the Internet, implications of Jihadism online, recruitment and radicalisation on the Internet, and counterterrorism and Jihadism online.

The 7 July bombings were an act of indiscriminate terror. This narrative summarises what the police, intelligence and security agencies discovered about the bombers and how and why they came to do what they did. This is one of a number of reports into aspects of the attacks.

On 7 July 2006 fifty-two people were killed in the terrorist attacks in London. This is the report of the findings of the Intelligence and Security Committee’s investigations into the attack.

The centrality of Arab mass media to Al-Qaeda’s political strategy has long been evident. From spectacular terror attacks designed for maximal media exposure, to carefully timed videos from Osama bin Laden and his lieutenant, Ayman al- Zawahiri, to the burgeoning realm of jihadi Internet forums, Al-Qaeda the organisation has increasingly become indistinguishable from Al-Qaeda the media phenomenon. This article explores the nature of Al-Qaeda’s relationship with the Arab media, which has been poorly understood leading to wrong policy conclusions.