Interoperability problems between cloud providers are one of the most serious issues of this new computing paradigm. A methodology is needed to systematically and effectively find and solve interoperability problems. For these reasons, a new methodology with detailed steps to find and solve interoperability problems is proposed here. This new methodology is focused and implemented on the platfo...

Cloud computing allows for access to ubiquitous data storage and powerful computing resources through the use of web services. There are major concerns, however, with data security, reliability, and availability in the cloud. In this paper, we address these concerns by introducing a novel security mechanism for secure and fault-tolerant cloud information storage. The information storage model f...

The paper investigates the possibility of consumer side resource accounting of cloud services, meaning, whether it is possible for a consumer to independently collect all the resource usage data required for calculating billing charges for pay-per-use cloud services. The accounting models of two widely used cloud services are examined and possible sources of difficulties are identified, includi...

Cloud computing is an amazing technology, which provides services to users on-demand. Since there are many providers in the cloud, users get confused in selecting the optimal cloud service provider. To overcome this limitation, federated cloud management architecture was proposed. There is no standard framework for ranking the cloud service providers in the existing federated cloud model. The p...

Many ‘Cloud Storage’ providers have launched in the last two years, providing internet accessible data storage and delivery in several continents that is backed by rigourous Service Level Agreements (SLAs), guaranteeing specific performance and uptime targets. The facilities offered by these providers is leveraged by developers via provider-specific Web Service APIs. For content creators, these...

Cloud computing addresses the use of scalable and often virtualized resources. It is based on service-level agreements that provide external users with services under request. Cloud computing is still evolving. New specific collaboration models among service providers are needed for enabling effective service collaboration, allowing the process of serving consumers to be more efficient. This pa...

Could computing service providers have to ensure that the service applications, cloud software, and the physical location of the cloud are secure. Furthermore, providers need to ensure that the service is secure on the client’s side of the system. To examine the client side security level we build economic models that consider the tradeoffs between system usability and client side security rest...

This work presents a new approach to ensure compliance to legal regulation in Cloud Computing, especially in Software-as-a-Service. Since high demanding business sectors, such as the health care sector, require high legal certainty, when contracting services offered by external providers. We provide a lightweight ontological representation of the German Federal Data Protection Act (BDSG) and a ...

A wide range of service offerings has been opened by the cloud computing industry to the customers. The cloud service providers and their services are increasing exponentially in present scenario of computing. In such a situation a customer faces the problem of selecting the best cloud service provider according to his personalized quality of service requirements. Moreover, the dynamic nature o...

The Cloud refers to hardware and software resources available across the Internet. The number of competing Cloud Service Providers (CSP) continues to increase as companies outsource their computing infrastructure to the Cloud. In this environment, consumers face several challenges, including finding the least expensive Cloud service configuration, migration between CSPs and dynamically changing...