“Grid” technology enables complex interactions among computational and data resources; however, to be deployed in production computing environments “Grid” needs to implement additional security mechanisms. Recent compromises of user and server machines at Grid sites have resulted in a need for secure password-authentication key-exchange technologies. AuthA is an example of such a technology con...

An efficient error recovery algorithm is essential for reliable multicast in large groups. Tree-based protocols (RMTP, TMTP, LBRRM) group receivers into local regions and select a repair server for performing error recovery in each region. Hence a single server bears the entire responsibility of error recovery for a region. In addition, the deployment of repair servers requires topological info...

This paper is on the construction of a server subsystem in a client/server system in an application context where the number of potential clients can be arbitrarily large. The implementation of the server is based on the well-known Triple Modular Redundancy (TMR) technique. The three server processes must process the client inputs in the same order to keep the server state consistent. While a c...

Nous proposons dans ce travail ARABASE une base de données d’images d’échantillons d’écriture arabe pour l’exploitation en reconnaissance optique de l’écriture (OCR-Optical Character Recognition). Cette base est implémentée sur un réseau à longue distance. L’étude des particularités morphologiques de l’écriture arabe, dans sa forme imprimée et manuscrite (en ligne et hors ligne), et les différe...

The IETF is currently standardizing a light-weight protocol framework for server redundancy and session failover: Reliable Server Pooling (RSerPool). It is the novel combination of ideas from different research areas into a single, resource-efficient and unified architecture. Server redundancy directly leads to the issues of load distribution and load balancing. Both are important and have to b...

For time-constrained applications, repair-server-based active local recovery approaches can be valuable in providing low-latency reliable multicast service. However, an active multicast repair service consumes resources at the repair servers in the multicast tree. A scheme was thus presented in [10] to dynamically activate/deactivate repair servers with the goal of using as few system resources...

This paper gives practical information along with theoretical background on Multicube project design decisions for scalable and reliable multicast service facilitating multimedia interworking of real users over the European ATM pilot. IP multicast mapping is proposed to be performed with the use of a minimal address resolution server serving a special multicast LIS within the ATM LAN. The feasi...