Efficient CP-ABE scheme for Privacy of PHR Based on OBDD Access Structure

We have implement efficient CP-ABE scheme for Privacy of PHR Based on OBDD Access Structure with the advancement of information and communication technology (ICT), the medical sector is undergoing a massive transformation. Health records are being digitized, stored remotely in the cloud and shared with different stakeholders. However, the use of the cloud for personal health record (PHR) storage presents data security and privacy challenges. Ciphertext-policy attribute-based encryption (CP-ABE) is being widely studied for ne-grained access control of PHRs in the cloud. Expressiveness, efficient and attribute access, among others, are some key requirements of a cloud based health systems. it is based on the expressive and non-restrictive ordered binary decision diagram (OBDD) access structure, and it securely outsources the computationally demanding attribute operations of both encryption and decryption processes without requiring a dummy attribute. Security analysis shows that the CESCR scheme is secure in the selective model. Simulation and performance comparisons with related schemes also demonstrate that the CESCR scheme is expressive and efficient