Enhanced timing enabled proxy re-encryption model for E-health data in the public cloud

The advancements made in cloud applications attracts the healthcare society. The analysis over Electronic Health Record (EHR) gains much importance among the research communities. As EHR contains sensitive information, the need of security and privacy is to be analyzed effectively. The services like outsourcing and increased computation has enhanced the usage of the digital technologies. The digital data interconnects with different network devices which lead to the study of reliability, scalability and security. Security is the major part of the outsourced databases. Prior works like searchable encryption and proxy re-encryption have been introduced by research communities. Still, the security requirements of the healthcare application are not yet achieved. Notwithstanding, prior searching encryption degrades in terms of storage computation. In this paper, we have proposed timing enabled proxy reencryption system that permits users to access the data under certain time period T. Each identified user is defined with set of attributes and valid time period T. Security analysis in terms of decryption key compromised, Expiration of identity, conjunctive based similarity keyword search and lessened complexity of key update phase have been studied.