Cloud computing delivers new levels of being connected, instead of the once disconnected PC-type systems. The proposal in this paper extends that level of connectedness in the cloud such that cloud service instances, hosted by providers, can relocate between clouds. This is key in order to provide economical and regulatory benefits but more importantly liberation and positive market disruption....

Today’s commercial cloud infrastructure service providers offer limited resource elasticity, leaving a gap between the vision of full on-demand/utility computing (“computation like electricity from the power plug“) and the economically or technically motivated limitations of virtualisers, cloud stacks and services. For instance, Amazon as popular resource vendor mandates a lower elasticity boun...

In this paper, we present a brokering logic for providing precise end-to-end QoS levels to cloud applications distributed across a number of different business actors, such as network service providers (NSP) and cloud providers (CSP). The broker composes a number of available offerings from each provider, in a way that respects the QoS application constraints while minimizing costs incurred by ...

In the last few years, adoption of cloud computing has shown a marked increase across the world. Moreover, the smaller markets, viz., Asia-Pacific, Latin America, Middle-East, etc., are expected to grow at more than the average rate for the next few years. While this is good news for cloud service providers, significant obstacles to cloud adoption still remain a major cause of concern, for exam...

Privacy in cloud computing is at the moment simply a promise to be kept by the software service providers. Users are neither able to control the disclosure of personal data to third parties nor to check if the software service providers have followed the agreed-upon privacy policy. Therefore, disclosure of the users‘ data to the software service providers of the cloud raises privacy risks. In t...

Infrastructure as a Service is a provision model in which a Cloud Service Provider (CSP) outsources the equipment used to support operations, including storage, hardware, servers and networking components. In such an service model customer stores his/her information in the hands of service providers, the insider attacker, hacking etc are vital corners to be handled, many have proposed solutions...

Energy efficiency has become an important managerial variable of IT management. Whereas cloud computing promises significantly higher levels of energy efficiency, it is still not known, if and to what extent outsourcing of software applications to cloud service providers affects the overall energy efficiency. This research is concerned with the allocation of cloud services from providers to cus...

This paper presents a solution for RESTful cloud storage in a dynamic identity federation. With dynamic federations, Cloud Service Providers are able to find Identity Providers autonomously in the cloud in order to make services flexible, scalable and interoperable. By combining a Representational State Transfer architecture with SAML-based identity federation, a distributed and decentralized c...

This paper presents a privacy-preserving system for participatory sensing, which relies on cryptographic techniques and distributed computations in the cloud. Each individual user is represented by a personal software agent, deployed in the cloud, where it collaborates on distributed computations without loss of privacy, including with respect to the cloud service providers. We present a generi...

Cloud federation systems have recently emerged as a scalable delivery model that interconnects services from two or more cloud providers for load balancing and accommodating spikes in demand. One challenge in this delivery model is the complexity of service selection due to the heterogeneity of cloud service descriptions among cloud federations. To overcome this complexity, it is crucial to uni...