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Implementation of a data storage and retrieval approach to achieve the best results is a challenge. The approach is proposed where access control is assured and a minimum of data information is revealed. On the other side special features of every cloud in a multi-cloud storage system make implementation more complicated. In this paper, the authors will present important problems, solutions, algorithms, comparison results, and details of the implementation of secure data storage and retrieval approach in a multi-cloudIoT system.

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