Marvin A. Sirbu

Learn More
Multicast and unicast traffic share and compete for network resources. To facilitate efficient and equitable resource allocation between traffic types, this paper advocates a costbased approach to multicast pricing. When prices are set to reflect actual network resource consumption, market distortion is minimized. Additionally, this paper calls for pricing(More)
As our economy and critical infrastructure increasingly relies on the Internet, the insecurity of the underlying border gateway routing protocol (BGP) stands out as the Achilles heel. Recent misconfigurations and attacks have demonstrated the brittleness of BGP. Securing BGP has become a priority.In this paper, we focus on a viable deployment path to secure(More)
Netbill is a business model, set of protocols, and software implementation for commerce in information goods and other network delivered services. It has very low transaction costs for micropayments (around 1¢ for a 10¢ item), protects the privacy of the transaction, and is highly scalable. Of special interest is our new certified delivery mechanism which(More)
The Informedia Digital Video Library Project is developing new technologies for creating full-content search and retrieval digital video libraries. Working in collaboration with WQED Pittsburgh, the project is creating a testbed that will enable K-12 students to access, explore, and retrieve science and mathematics materials from the digital video library.(More)
In this work we describe a method for fully distributed authentication using public key cryptography within the Kerberos ticket framework. By distributing most of the authentication workload away from the trusted intermediary and to the communicating parties, significant enhancements to security and scalability can be achieved as compared to Kerberos V5.(More)
Integrating multiple services into a single network is becoming increasingly common in today's telecommunications industry. Driven by the emergence of new applications, many of these services will be offered with guaranteed quality of service. While there are extensive studies of the engineering problems of designing integrated-services networks with(More)
In recent years, the landscape for wireless technology has changed substantially, with profound implications for the evolution of last-mile access infrastructure. This paper provides a high-level introduction to emerging trends in wireless technology, with a special focus on how these are impacting municipal broadband deployments. Also discussed are some of(More)
This paper focuses on a narrow band technical solution that uses decentralized spectrum sharing to facilitate open access among competing Personal Communications Services (PCS) operators. Existing policies that apportion spectrum by Fixed Channel Assignment (FCA) involve inefficiencies resulting from fragmentation of the available resource into mutually(More)