Norman Ahmed

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Service-Oriented Architecture (SOA) is becoming a major paradigm for distributed application development in the recent explosion of Internet services and cloud computing. However, SOA introduces new security challenges not present in the single-hop client-server architectures due to the involvement of multiple service providers in a service request. The(More)
Content-based publish/subscribe system performance depends upon the efficient subscription matching and event dissemination to interested subscribers. We propose a hybrid content-based publish/subscribe protocol for large size events wherein a centralized brokering system is coupled with a decentralized BitTorrent-like peer-to-peer (P2P) protocol for(More)
The Publish and Subscribe (pub/sub) dissemination paradigm has emerged as a popular means of disseminating time-sensitive or filtered information, usually in the form of middleware within the enterprise systems of Service-Oriented Architectures (SOA). Through the use of an event service, or broker, published information is disseminated only to the(More)
Service Oriented Architecture (SOA) is an architectural pattern providing agility to align technical solutions to modular business services that are decoupled from service consumers. Service capabilities such as interface options, quality of service (QoS), throughput, security and other constraints are described in the Service Level Agreement (SLA) that(More)
Service Oriented Architecture (SOA) is an architectural style that provides agility to align technical solutions to a modular business Web Services (WS) that are well decoupled from their consumers. This agility is extended to the Cloud model. To achieve a high level of security and a degree of decoupling, SOA encourages the use of standardized transport(More)
The user anonymity is an important security factor to protect personal privacy in mobile ad hoc networks. Recently, Wu et al. proposed an ad hoc on-demand position-based private routing protocol (AO2P), but the AO2P is vulnerable to some collaborative attacks, such as blackhole & wormhole attacks. Once any compromised node is included in a route, it can(More)
Service Oriented Architecture (SOA) is an architectural style that provides agility to align technical solutions to modular business Web Services (WS) that are well decoupled from their consumers. This agility is established by interconnecting WS family of standards specification protocols (commonly referred to as WS-* (WS-star)) to enable security, ease of(More)