Abstract
Managing and controlling access to the tremendous data in Cloud storage is very challenging. Due to various entities engaged in the Cloud environment, there is a high possibility of data tampering. Cloud encryption is being employed to control data access while securing Cloud data. The encrypted data are sent to Cloud storage with an access policy defined by the data owner. Only authorized users can decrypt the encrypted data. However, the access policy of the encrypted data is in readable form, which results in privacy leakage. To address this issue, we proposed a reinforcement hiding in access policy over Cloud storage by enhancing the Ciphertext Policy Attribute-based Encryption (CP-ABE) algorithm. Besides the encryption process, the reinforced CP-ABE used logical connective operations to hide the attribute value of data in the access policy. These attributes were converted into scrambled data along with a ciphertext form that provides a better unreadability feature. It means that a two-level concealed tactic is employed to secure data from any unauthorized access during a data transaction. Experimental results revealed that our reinforced CP-ABE had a low computational overhead and consumed low storage costs. Furthermore, a case study on security analysis shows that our approach is secure against a passive attack such as traffic analysis.
Highlights
In the ever-increasing era of data breaches, providing the integrity and privacy of Healthcare Cloud storage is a challenging issue in the Cloud environment, especially when the demands and requests for Cloud services are increasing
In addition to performing the encryption algorithm, the data attributes in the access policy are further concealed
It makes the unauthorized party unable to learn any details about the access policy and encrypted data
Summary
Cloud computing has become a priority and integral to modernizing the information technology (IT) environment. It spawned a whole new dimension of IT, which utilized a wide range of resources that contributed to many domains, such as business, military, health, and medical. In the healthcare and medical domain, Cloud computing has been adopted to facilitate day-to-day operations. This is because the Cloud provides ‘on-thefly’ services, that is, storage, computation, and data sharing, which allow healthcare and medical practitioners to run their business according to their required operations. Electronic health records (EHRs) have been widely employed in the healthcare industry to improve the accessibility and sharing of medical data among medical practitioners. Cloud adoption in organizations is expected to lift performance with the high-speed deployment of services and to improve clients’ satisfaction
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