M.P. Radhini et al, International Journal of Computer Science and Mobile Computing, Vol.3 Issue.4, April- 2014, pg. 514-521 © 2014, IJCSMC All Rights Reserved 514 Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology ISSN 2320–088X IJCSMC, Vol. 3, Issue. 4, April 2014, pg.514 – 521 RESEARCH ARTICLE Secure Sharing of Medical Records Using Cryptographic Methods in Cloud M.P. Radhini 1 , P.Ananthaprabha 2 , P.Parthasarathi 3 1 P.G. Student, Department of CSE, Sri Krishna College of Technology, Coimbatore 2,3 Assistant Professor Department of CSE, Sri Krishna College of Technology, Coimbatore Email: 1 radinimp4@gmail.com, 2 ap.prabha@gmail.com, 3 sarathi.p@gmail.com Abstract —Cloud based data is safer than paper and client-server records. Now, medical practices just have to be willing to look to the cloud for the future of healthcare IT. There are lots of security issues related with the storage of sensitive personal health information in the cloud, which will make lots of security challenges to the PMR privacy and confidentiality. Cryptography is an essential tool that helps to assure our data accuracy. The Cryptographic techniques can be employed to protect the data in cloud environment. The technique used for security is multiple authority attribute based encryption technique which focuses on the multiple data owner scenario and divide the users in the PMR system into multiple security domains which leads to key management complexity for owners and users. In the proposed distributed attribute based encryption scheme PMR can be accessed from any hospital using a single key thereby reducing the complexity of key management. KEYWORDS: Personal medical records; cloud computing; key management; attribute based encryption; Personal health record I. INTRODUCTION Cloud computing is an efficient technique by which the user can access any data from anywhere and anytime through internet. T hus it’s providing the new world of computing technology to the world. The personal health records are thus also using this cloud computing technology for the efficient storage and retrieval system. But there is still a comparison is going on with the electronic health record and personal health record. Electronic health record is the electronic version of the medical record of the care and treatment the patient receives. It is maintained and managed by the health care organizations. But our PMR is the collection of important information that the patient maintain about their health or the health of someone they are caring for. It may be short and simple or very detailed.[1]The traditional PMR was in the form of paper documents, electronic files maintained by their computer, but now the PMR is created by using the tools available in the internet. So which make the facility to use the health information across any distances, and to share with the selective users with special read and write access. But while using third party service providers there are many security and privacy risks for PMR. The main concern is whether the medical record owner actually gets full control of his or her data or not, especially when it is stored in third party servers which is not fully trusted.