Abstract
Electronic health record (EHR) stores not only the patient’s health-related data but also the sensitive individual information. Consequently, data security and access privacy are the greatest concern of EHR applications while sharing the data through the cloud. Ciphertext policy attribute-based encryption (CP-ABE) is one of the popular one-to-many encryption schemes, which helps to attain fine-grained access control in cloud domain. In CP-ABE, since the access policy is attached to the ciphertext, anyone with the ciphertext can see the data owner’s policy that may cause privacy leakage. In this paper, we proposed a CP-ABE cryptosystem that supports access policy obfuscation and outsourced decryption enabling efficient and secure operations in cloud environment. Linear secret sharing (LSS) scheme is used for supporting any monotonic access structures, thereby improving the access policy’s expressiveness. We have incorporated prime-order bilinear group and matrix-based LSS scheme that increases the computational efficiency of the cryptosystem. Finally, we have evaluated the performance of our CP-ABE cryptosystem using practical implementation utilizing Charm framework.
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