Cloud-based Secure Personal Health Record Management System using Mixnode and Blockchain

Security and privacy of personal health information are the two major concerns for the users of an e-health system. For privacy reasons, it is desired that unauthorized users including the third parties cannot link the outsourced e-health documents to their owners. This work proposes a symmetric key-based scheme that employs mix networks for achieving un-observable outsourced data access and Blockchain for achieving outsourced data integrity. An important security requirement named forward secrecy is implemented on Blockchains so that a medical health care provider is restricted to access any future health document after her session expires. Procedures for publishing and accessing e-health documents are proposed and analyzed.