SECURE FILE ACCESS USING ATTRIBUTE BASED ENCRYPTION WITH KEYWORD SEARCH

Abstract

Patient Health Records used in management of health records contains sensitive information related to every patient. These health records are retained by the patient on his mobile device and could be outsourced to servers for management or processing and these servers are generally un-trusted. This PHR contains sensitive and important health related information, so we need to ensure security and privacy of our health data. Along with confidentiality, we want the patient to have control over his health data, so we first encrypt the PHR with Attribute Based Encryption and then outsource to the server for storage and also if any search operation is required. PHR‟s contains different sections and in order to give selective access based on the content of the data and who is going to use it, the encryption is sectional using CPABE, which is a type of Attribute Based Encryption. CPABE fulfills the requirement of providing fine-grained access control. Different Access Policies could be used to encrypt sections of the Patient Health Record. To reduce the overhead of decrypting whole PHR and then searching the records containing some keywords, we want search mechanism on the encrypted data. So, based on the keywords of the sections of PHR, we construct our search mechanism. Searchable Symmetric Encryption is use to achieve this searchability on encrypted data. Conjunctive keyword search query is also incorporated to provide better search query options to the medical professional. In the improved version, patient also creates a hash table on the unique keywords contained in the PHR and outsource this also to the server. Authorized users whose attributes satisfy the access policy of different sections can only decrypt the corresponding the sections.