Seyedmohammad Nouraniboosjin¹, Melika Yousefi², Sadaf Meisami³, MelinaYousefi⁴ and Sajad Meisami², ¹Worcester Polytechnic Institute, USA, ²Illinois Institute of Technology, USA, ³Kharazmi University, Iran, ⁴Isfahan University of Technology, Iran

Medical care is one of the most important parts of human lives, and now with the invention of the internet of things(IOT) and cloud computing streamlining the treatment process is becoming a main topic of research. The problem is the sensitivity of the medical data which raises concerns about data privacy in the system. storing vast amount of patients’ data in the cloud which is controlled by a single trusted third party is common nowadays but, this manner poses great privacy risks and security concerns because it makes it possible for the cloud to use the stored data for illegal purposes. In this paper we try to answer this question that ’how to resolve these problems using the blockchain technology?’. we propose a novel protocol that combines Blockchain technology and cryptographic primitives such as ring signature and searchable encryption in order to remove the need for a trusted third party and providing an efficient privacy preserving access control mechanism. Also when it comes to the applications of the blockchains in areas other than cryptocurrencies, combining this technology to other cryptographic primitives can lead to unique features. In this paper we used ring signatures in order to protect the patients’ privacy and also by using the blockchain technology we were able to eliminate the need for a trusted third party and provide security for a searchable encryption scheme.

Blockcchain, IOT, privacy, cryptography, searchable encryption