The cloud system using data deduplication eliminates control methods while decreasing user bandwidth needs for duplicate data storage. Most traditional methods using trusted key server (KS) assistance suffer from weaknesses and restrictions caused by data leakages among other operational challenges. A trusted KS failure will result in the collapse of the entire system when operating at a single point of failure. This study introduces SED which serves as a secure and efficient data deduplication technique applicable to joint cloud storage systems whenever they operate globally through cloud partnerships. SD serves both data synchronization and dynamic information transfer functions independently from a reliable KS repository. The traditional cloud storage system commonly experiences single point of failure, but SED technology allows users to bypass this issue. Our SED shows strong anti-attack features according to theoretical evaluations whereby it resists collusion and brute-force attacks and provides semantic security under the random oracle model. From a technical point of view, SED performs data redundancy removal without causing computation, connection, or storage expenditure. The functionality and operational power of SED improves performance for users at the client level. Our method shows superior performance based on the outcome of the comparison tests compared to existing methods.