Collaborative applications like video/audio conferencing, IP telephony, file sharing, collaborative work spaces, and multi-user games, having varied security requirements, require a secure and reliable group communication system to provide co-ordination among the processes. Peer to peer computing allows users to interact with each other and find and share resources without requiring a centraliz...

In addition to maintaining consistency of the database, secure concurrency control algorithms must be free from covert channels arising due to data conflicts between transactions. The existing secure concurrency control approaches are unfair to transactions at higher access classes. In this paper, a secure two-phase locking protocol is presented, which is correct and free from covert channels. ...

Secure knowledge management for eBusiness processes that span multiple organizations requires intraorganizational and interorganizational perspectives on security and access control issues. There is paucity in research on information assurance of distributed interorganizational eBusiness processes from a business process perspective. This paper presents a framework for secure semantic eBusiness...

Access control is an important aspect in guaranteeing data privacy within XML data sources which are accessed by users with different access rights. The goal of predicative access control for XML data sources is to use XPath expressions to describe that fragment of a given document or database that can be accessed by queries of a certain user. Our approach to access control hides the XML data s...

The interoperability among different data formats over the Internet has drawn increasing interest recently due to more and more heterogeneous data models are used in different Web services. In order to ease the manipulation of data models for heterogeneous data, generic model management has been intensively researched and also implemented in a prototype since its first introduction. Access cont...

Mobile agent systems provide new perspectives for distributed e-commerce applications. These applications may present specific restrictions, making mobile agent systems a feasible solution. Even so, mobile agents present some security related problems. An important one is resource access control. The ability for mobile agents to provide a simple, scalable, flexible, and secure access control sy...

For army, the mobility of an entire communication network is desirable. A large mobile communication network inevitably involves a large network of wireless routers. The throughput of a large network of wireless routers critically depends on distributed medium access control (MAC). In this paper, we present a MAC scheme to be called opportunistic synchronous array method (OSAM). The O-SAM is di...