A Multilayer Encryption Model to Protect Healthcare Data in Cloud Environment

21st Century is recognized as an era of cloud computing and it has become an integral part for any organization. It is equally suitable for all the organizations e.g. education, government, public sector, health care department There are two types of patient information i.e. protected/sensitive health information and general information. Protected information (Phone no, ATM, Security no, MR no etc.) requires more confidentiality as compared to general information. Therefore, for some protected health information without patient association (general disease name, symptoms) will be very helpful for research experiments. Health information is protected by achieving confidentiality, integrity and availability, when data is stored in cloud environment. Cryptography methods provide different techniques to protect the data stored in cloud environment. In this paper, we have suggested a multilayer encryption technique to ensure the confidentiality of data stored in cloud environment. This suggested technique will improve the security of cryptographic techniques when used in multilayered format. We have set up a local system for the experiment. We have used the RDBMS (Microsoft SQL Server) and Framework 4.5. A set of 500 dummy patient records is used to test the proposed techniques. The experiment was performed to check the confidentiality of the suggested techniques. This experiment shows us that multilayer encryption techniques is more suitable for public health sectors when data is in cloud environment.