Since the devastating attacks of September 11, 2001 there have been numerous discussions on the issue of terrorism and terrorist networks, such as al Qaeda, within the media and the intelligence community. At times these discussions have created an image of the terrorist phenomenon as one of a monolithic and unstoppable menace continuing to spread around the world unabated. Lost in these discus...

SUMMARY. Chinese family and marriage strengths and challenges are delineated in this article, including equity in marriage, affection, the ability to adapt to changes, mutual trust, compatibility, harmony, and family support. Despite the fact that Chinese households are getting smaller as a result of governmental policy and the broadening of housing markets, families remain crucial support netw...

In this paper we consider a model where malicious agents can corrupt hosts and move around in a network of processors. We consider a family of mobilefault models MF( t n−1 , ρ). In MF( t n−1 , ρ) there are a total of n processors, the maximum number of mobile faults is t, and their roaming pace is ρ (for example, ρ = 3 means that it takes an agent at least 3 rounds to “hop” to the next host). W...

Over the last years, most websites where users can register (e.g., email providers and social networks) adopted CAPTCHAs (Completely Automated Public Turing test to tell Computers and Humans Apart) as a countermeasure for automated attacks. The battle of wits between designers and attackers of CAPTCHAs led to current ones being annoying and hard to resolve for users, while still being vulnerabl...

Wang, Qihua. Ph.D., Purdue University, May 2009. Access Control Policy Management. Major Professor: Ninghui Li. Access control is the traditional center of gravity of computer security [1]. People specify access control policies to control accesses to resources in computer systems. The management of access control policies include policy specification and policy analysis. In this dissertation, ...