Mathematics of Information Technology and Complex Systems Complex Adaptive Networks for Computing and Communication (CANCCOM)


Project Highlights



Team Members

Partner Organizations







    - Mobile and Wireless Computing

Led by Michel Barbeau

Participating researchers include:

Prof. Evangelos Kranakis

Prof. Ramiro Liscano

Prof. Paul Van Oorschot

The problem of service discovery is about dynamically locating on a network servers that fulfill requirements of clients. Service discovery protocols have been designed for that purpose and they can always been applied in several different ways. A strategy is way to apply a service discovery protocol. For example, in a strategy, that we call uniform memory less, each server posts to a random set of l nodes all the services it has to offer and each client queries a random set of l' nodes for the services it requires. The goal of this work is to devise service discovery strategies and to characterize them in terms of cost and latency.

Regarding satellite transport protocols, we look at the problem of handling communication errors compromising the reliable and efficient delivery of units of data from application to application. Satellite networks have a unique set of link errors including bit corruption, handoff and limited connectivity as well as higher variation of latency over short time periods. Unfortunately, most transport protocols are only designed to handle congestion-related errors common in wired networks. This inability to handle multiple kinds of errors results in severe degradation in effective throughput and energy saving, which are relevant metrics for a satellite environment. Our approach consists of integrating differentiating error control strategies in transport protocols.

Threats to security of mobile and wireless networks are facts of life. The research on intrusion detection in mobile and wireless networks acknowledges the fact that creating a defense for every possible method of attack is an impossible task. The long term goal of this research is to develop tools to help network managers to detect and pinpoint sources of attacks and tools to quickly recover and repair damages caused by attacks (e.g. contaminated data). Currently, the focus is on detecting and pinpointing tools, that is to say, intrusion detection systems.

Spontaneous communication is about the establishment, on the fly, of communication among members of a group of users for collaboration purposes. It a model of user level communication typically encountered in mobile and wireless networks. Collaboration groups are said virtual because their topology doesn’t necessarily matches the underlying physical topology. Virtual private services address the challenges associated with distributed responsibility for access control of resources. Virtual private services ensure security and privacy policies that are adhered to through coordinated policy enforcement points. The core challenge faced in this communication model is the ability to develop a solution that ensures consistent access-control policies across a set of distributed firewalls between disparate enterprises. While current tools can easily distribute policy files, the deeper problem in ensuring consistent access policies, across many different systems, is far more difficult.

Additional information can be found in the NETWORKS and SECURITY Groups.


                                                        Maintained by Zheyin Li     Copyrights©CANCCOM 2003    Last modified: Thursday, 20-Nov-2003 11:47:28 EDT