Intrusion detection systems (IDSs) are important components of network security. However, it is well known that current IDSs generate large amount of alerts, including both true and false alerts. Other than proposing new techniques to detect intrusions without such problems, this thesis presents...

Service engagements arise commonly in business and scientific computing. A service engagement is characterized by autonomous parties coming together in a contractual arrangement to share resources or carry out tasks for one another. The autonomy of the participants is key, meaning that there is...

Access control is a mechanism for achieving confidentiality and integrity in software systems. Access control policies (ACPs) define how access is managed and the high-level rules of who can access what information under certain conditions. Traditionally, access control policies have been...

Trust is a crucial basis for interactions among parties in large, open distributed systems. Yet, the scale and dynamism of such systems makeit infeasible for each party to have a direct basis for trusting another party. For this reason, the participants in an open systemmust share information...

Data analysts often prefer access to data in the form of original tuples(i.e., microdata), instead of pre-aggregated statistics, since the former offers advantages in information flexibility and availability. Two problems should be addressed before releasing microdata. First, individual's...

Trading agent concept is very useful for tradingstrategy design and market mechanism design. In thispaper, we introduce the use of trading agent for marketsurveillance. Market surveillance agents can bedeveloped for market surveillance officers andmanagement teams to present them alerts and...