Data sharing among group resource in the cloud server is a major problem, so cloud computing provides an efficient and economical solution. Due to the change of membership frequently, data sharing in a multi-owner manner to an un-trusted cloud is a challenging issue. It provides a multiple levels of security to share data among multi-owner manner. First the user selects the text based password. Then the One-Time Password is automatically generated and sent to the corresponding e-mail account. This paper is devoted to investigating fundamental security tools f or realizing the three properties we described. Note that there are other security issues in a data sharing system which are equally important, such as availability and access control. But the study of those issues is out of the scope of this paper. Data authentication is a fundamental problem in data management, where we wish to design secure and efficient protocols that prove the authenticity of computations in un-trusted or adversarial data distribution environments. The problem is of both practical and theoretical importance. More and more in distributed, pervasive or Internet computing, information is delivered through un-trusted computing entities, raising crucial security threats with respect to data authenticity. From a theoretical point of view, data authentication introduces new dimensions both in the design of algorithms and in cryptography. On one hand, known data management and data structuring techniques often need to be reexamined, in new data dissemination settings, where the data distributor and the data owner are different entities. On the other hand, directly applying traditional and well-studied message authentication techniques for data authentication where data cannot be treated as a whole is often inadequate to provide efficient solutions.