To reduce the storage space and bandwidth consumed Data deduplication is one of the most important methods of data compression to eliminate multiple copies of the same data. This paper aims to principally resolve the issue of allowed data deduplication, in order to safeguard the security of data. Before outsourcing data must be encrypted with the convergent encryption technique in order to protect the security of sensitive information and to facilitate deduplication. Alongside the data the user's access level is analyzed to determine if they are an authorized user. In accordance with the definitions set forth in the proposed security model Security analysis shows that our approach is safe. We prove that, compared to traditional operations, our suggested duplicate check method is very low-cost. We have put our proposed legal duplicate-check system in use as a model and conduct tests on it. By utilizing various methods, this paper attempts to minimize the amount of duplicate data that occurs when using the cloud.