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Free decentralized solutions allow real control of individuals over their data. By having the choice of hosting the platform, combined with the transparency of code executed, the owner ensures that his data is not analysed without his knowledge and reduces the risk of large-scale hacking. However, this does not solve a fundamental paradox: to be completely sovereign over his personal data, the owner must be able to control the server that stores them and understand the code that runs on it. However, this is only really possible if the owner is an expert. This paper presents a survey on secure cloud data sharing services in multi-level environments.
The paper details centralized, discretionary, mandatory and role-based access controls. The concepts of encryption and personalized cloud sharing is discussed.