Page 22 - Cloud computing: From paradigm to operation

1 Framework and requirements for cloud computing

– Reversibility: A process for the cloud service customer to retrieve their cloud service customer data
and application artefacts and for the cloud service provider to delete all cloud service customer
data as well as contractually specified cloud service derived data after an agreed period;
– Security: Ranges from physical security to application security, and includes requirements such as
authentication, authorization, availability, confidentiality, identity management, integrity,
non-repudiation, audit, security monitoring, incident response, and security policy management;
– Service levels and service level agreement: The cloud computing service level agreement (cloud
SLA) is a service level agreement between a cloud service provider and a cloud service customer
based on a taxonomy of cloud computing specific terms to set the quality of the cloud services
delivered. It characterizes quality of the cloud services delivered in terms of: 1) a set of measurable
properties specific to cloud computing (business and technical) and 2) a given set of cloud
computing roles (cloud service customer and cloud service provider and related sub-roles).
Many of these cross cutting aspects, when combined with the key characteristics of cloud computing,
represent good reasons for using cloud computing. However, cross cutting aspects like security, protection
of PII, and governance have been identified as major concerns and in some cases an impediment to the
adoption of cloud computing.

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