Cloud computing has become a trend with the provision of innumerable benefits. Cloud has become an emerging standard that brings about various technologies and computing ideas for internet at very low cost. Massive storage centres are provided by the cloud which can be accessed easily from any corner of the world and at any time but there are certain issues and challenges faced by the user while using cloud computing with regard to security. However new challenges popped out to ensure confidentiality, integrity and access control of the data. To address these problems we have a tendency to propose a theme that uses threshold cryptography within which data owner divides users in groups and provides single key to every group at the moment, that single key  ( separate by formula that becomes distinctive secret key )  is distribut e to every user of that cluster for decoding of information. The most important feature of this theme is that cut back the number of security key and it additionally make sure that solely attested users can access the outsourced knowledge.