As the cloud computing technology is increasing its boom, its importance in the medical services is also increased. We propose, a security mechanism for the cloud to store all the data from the hospitals such as electronic health records (EHRs) with ABE scheme based on block chain technology. It offers the hospital authorities and the users the security to login and also store their private data. Attribute-based encryption (ABE) algorithm realizes flexible and fine-grained access control, a large number of patients subscribe or unsubscribe the different medical services frequently in the cloud, which takes a huge cost for membership management. In this paper, we will construct a dynamic key policy ABE scheme in the distributed telemedicine system with the keys sent to the users and the authorities. The user and the authority’s credentials are not overlapped. They are stored within their boundaries with all the CP-ABE and the KP-ABE schemes. With the Block chain technology, the Personal Healthcare Information stored in public cloud is covered in integrity, which avoids the misdiagnosis coincidence from the wrong electronic fitness information distorted by a malicious user or authority from the internal cloud. Ultimately, we analyse the collusion assault in multiple authorities and formally show the safety of this protocol in a well-formed version.