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The increasing dependency on cloud computing has drawn attention to the security weaknesses of cloud providers. Not only how information is accessed, but also where and when have become important considerations in cloud security. Certain situations exist where it is necessary to restrict access to cloud resources based on time and location. An example is a policy for a medical institution where doctors can only access patient records at hospitals during their shifts. The Generalized Spatio-Temporal Role-Based Access Control model (GSTRBAC) determines users' access to resources based on such information. This poster proposes a cloud-based software architecture and outlines it possible implementation of the GSTRBAC model. CCS CONCEPTS• Software and application security → Software and application security; • Security and privacy → Systems security.

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