Massimiliano Rak

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The cloud paradigm appeared on the computing scene in 2005 with the Amazon Elastic Compute Cloud (EC2) . After this date, a large set of related technologies has been developed. In the academic world, and especially in the HPC area, cloud computing is in some way in competition with the GRID model, which offers a middleware based approach. One of the(More)
Cross platform APIs for cloud computing are emerging due to the need of the application developer to combine the features exposed by different cloud providers and to port the codes from one provider environment to another. Such APIs are allowing nowadays the federation of clouds to an infrastructure level, requiring a certain knowledge of programming the(More)
In a world made of interconnected systems which manage huge amounts of confidential and shared data, security plays a significant role. Policies are the means by which security rules are defined and enforced. The ability to evaluate policies is becoming more and more relevant, especially when referred to the cooperation of services belonging to un-trusted(More)
The breakthrough of Cloud comes from its service oriented perspective where everything, including the infrastructure, is provided “as a service”. This model is really attractive and convenient for both providers and consumers, as a consequence the Cloud paradigm is quickly growing and widely spreading, also in non commercial contexts. In such a scenario, we(More)
The federation of Cloud resources can be treated at different levels of abstractions. In this paper we focus on application programming interfaces for building Cloud-based applications using services from multiple Cloud providers. A full stack of APIs is proposed to decouple the development of a Cloud-based application from its deployment and execution. A(More)
Both cloud and grid are computing paradigms that manage large sets of distributed resources, and the scientific community would benefit from their convergence. This paper proposes a novel computing model, cloudgrid, able to achieve full cloud and grid integration. After presenting its three-layer architecture, the security issues involved are analyzed,(More)