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— The near future evolution of the cloud computing can be hypothesized in three subsequent stages: stage 1 " Monolithic " (now), cloud services are based on independent proprietary architectures; stage 2 " Vertical Supply Chain " , cloud providers will leverage cloud services from other providers; stage 3 " Horizontal Federation " , smaller, medium, and(More)
—Cloud Computing is becoming one of the most important topics in the IT world. Several challenges are being raised from the adoption of this computational paradigm including security, privacy, and federation. This paper aims to introduce new concepts in cloud computing and security, focusing on heterogeneous and federated scenarios. We present a reference(More)
—Cloud environments offer a variety of concrete and abstracted entities which need to be identified. An example of cloud environment is the European project RESERVOIR, which similarly to other platforms characterized by a high level of dynamism, needs to identify and resolve resources. RESERVOIR has to manage allocation, deallocation and migration of(More)
—Nowadays, cloud computing is considered as a new charming technology, where new opportunities in ICT world are becoming real. Cloud is appealing many IT companies, but the largest business is in hand of big cloud operators. In the near future the scenario could change, and becoming much more complex even involving small and medium providers. Cloud(More)
In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: a b s t r a c t Cloud federation offers plenty of new services and business(More)
—Nowadays, the cloud computing ecosystem includes hundreds of independent and heterogeneous clouds. Most of such cloud platforms can be considered as " islands in the ocean of the cloud computing " and do not present any form of federation. At the same time several clouds are beginning to use the cloud-based services of other clouds, but there is still a(More)
—This paper focuses on Platform as a Service (PaaS). From the advent of Cloud computing, the latest trend has been to design ad hoc platforms specialized to address given operational scenarios. In this context, the need of an adaptable, fault tolerant and secure cloud platform for the development of specific PaaS is becoming more and more compelling. In(More)