On developing dynamic and efficient cryptosystem for safeguarding healthcare data in public clouds

With the greater development in internet, in medical field, all the confidential information about the patients and their test results are maintained in any of the remote servers around the world. Because of the confidentiality to be maintained in case of handling the patient related data, it is very crucial that the data is handled only by the authorized personnel. In the conventional method of data storage, the data are normally encrypted in the patient’s side and then they are kept securely in remote cloud server. So, the patient is empowered to decide the visibility of his data, hence becomes the data owner. But, the main disadvantage of this approach is its restricted data availability for the doctors who need to access the medical data. In this paper we propose two dynamic and efficient cryptosystems for secure storage and access of medical data. First algorithm exploits the High Secure Encryption Standard scheme, which has the advantage of making an encrypted data stored in the remote cloud is available for searching. Moreover, this approach ensures security and privacy both in patient’s side and the doctor’s side. Also, we propose another approach for developing a key management system, which will effectively handle the allocation of encryption and decryption keys for all the people who are handling the sensitive medical data of the patients. The experimental results show that our proposed model of cryptosystem ensures that the data has been stored and retrieved with higher security with relatively optimized searching time. Moreover, this approach is very efficient in terms of space complexity, search indexing and secret access of data comparing with many of the existing algorithms.