Directly revocable Attribute Based Encryption scheme under Ciphertext-policy

Abstract

Attribute-Based Encryption(ABE) came up as an significant cryptographic tool to envision secure fine-grained data sharing and access control. In this paper, we elaborate ABE to more expressive Ciphertext-policy Attribute-Based Encryption(CP-ABE) in consideration with Revocation which is a major issue to achieve in ABE. Specifically, we use direct revocation ABE which permits the trusted authority to revoke users by simply updating revocation list, without interacting with the non-revoked users which is not likely with respect to indirectly revocable ABE. We give a concrete construction and provides certain comparison parameters in order to determine efficiency of our scheme over other existing scheme.