Abstract
Security is one of the biggest concerns about Cloud Computing. Most issues are related to security problems faced by cloud providers, who have to ensure that their infrastructure is properly secure and client data are protected, and by the customers, who must ensure proper security measures have been taken by the provider in order to protect their personal data. When you move your information into the cloud, you lose control of it. The cloud gives you access to your data, but you have no way of ensuring no one else has access to these data. In this article, we propose an evaluation of a proof-of-concept implementation of a usage control system for an ex post enforcement of privacy rules regarding the disclosure of personal data to third parties. The system is based on cryptographic protocols and digital watermarking in medical services and electronic health records.
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