For governments and businesses, social movements, criminal organizations and terrorists alike, Information technology has become central to the way groups organize themselves and pursue global objectives. With the emergence of the Internet and new digital technologies - and particularly in the post-9/11 era of "homeland security" - the relationship between IT and security has found a new and pressing relevance. Here, a collection of scholars explores the ways IT has made traditional boundaries increasingly irrelevant, challenging traditional concepts of privacy, surveillance, vulnerability and above all, security.