DSAS: A Secure Data Sharing and Authorized Searchable Framework for e-Healthcare System.

By exchanging encrypted personal healthcare records (PHRs) with physicians or institutes engaged in medical research, an increasing number of patients in the e-healthcare system are able to access high-quality medical services. Yet, one of the key problems is that encrypted PHRs make it difficult to effectively search for information. Decreasing the amount of data used. Another problem is that the process of providing medical care necessitates a doctor's constant availability online, which may be too expensive for certain professionals to afford (for example, to be absent sometimes). This study develops a new, practical, secure proxy searchable re-encryption method that enables medical care providers to do remote PHR monitoring and research effectively and safely. The following features of our DSAS scheme ensure the privacy and confidentiality of PHRs:  only authorized doctors or research institutions have access to the PHRs;  Alice (the doctor-in-charge) is able to delegate medical decisions;  these features ensure that the healthcare records of patients collected by the devices are encrypted before uploading to the cloud server. With the cloud server, Bob (doctor-in-agent) or a certain research institution can conduct research and use it, therefore limiting the accessibility of information to the cloud server. We codify the notion of security and demonstrate our scheme's security. Eventually, performance analysis demonstrates the effectiveness of our plan.

KeyWords: Mobile healthcare sensor networks, proxy re-encryption, proxy invisibility, and searchable encryption.