  Nowadays companies are increasingly adopting the technology ofcloud
computing. This technology is subject to a lot of research and
continuousadvances are made. The use of cloud computing in the companies
advantagessuch as: reducing costs, sharing and exchange of information between
institutions,but the data in the Cloud computing are susceptible to be
compromisedand the companies are exposing to see their data loss. In this
study, we addressthe subject of security in cloud computing; we expose and
discuss someresearches that had been proposed to secure the data stored in the
cloud. Andthen we will present our new frameworks that ensure confidentiality
of datastorage in the cloud environment
