A Novel approach to Secure Patient Data in Cloud Storage

Abstract

Cloud Data's are vulnerable to malicious threats. Among the data that are stored in cloud, patient record stored by hospitals is profound to be sensitive. Security breaches are common in public cloud. In order to address this issue, a novel hybrid approach is provided in this paper. New round functions are introduced to increase the security level. To encrypt text data, stream cipher Chacha is utilized. Though Chacha cipher has been cryptanalyzed by many authors, still it is not feasible to attack this cipher in polynomial time. Next, to secure the scan images of the patients, two different encryption algorithms are utilized, namely, Advanced encryption standard (AES) and Blowfish. The encrypted data and images are finally stored in the cloud. It is observed that even if the adversary gets hold of the data, they cannot decipher to the original data in polynomial runtime.