In this paper, we provide an efficient CP-ABE scheme which can express any access policy represented by a formula involving the and (∧) and or (∨) operators.

Abstract. In a ciphertext-policy attribute-based encryption (CP-ABE) scheme, the data is encrypted under an access policy defined by a user.

We provide a comparison with some existing CP-ABE schemes and show that our schemes are more efficient. 1 Introduction. Public-key encryption is an asymmetric ...

A ciphertext-policy attribute based encryption scheme consists of four algorithms: Setup, Encrypt, KeyGen, and Decrypt. Setup(λ, U). The setup algorithm takes ...

In this paper, we study CP-ABE schemes in which access structures are AND gates on positive and negative attributes.

A ciphertext policy attribute-based encryption (CP-ABE) system consists of four fundamental algorithms: Setup, En- crypt, KeyGen and Decrypt. 2In a large ...

May 18, 2021 · In this paper, we propose two Ciphertext-Policy Attribute-Based Encryption Key Encapsulation Mechanisms that can be provided as services in the cloud.

Nov 26, 2008 · We provide a comparison with existing CP-ABE schemes and show that our schemes are more efficient. Especially,the computational work done by the ...

This paper designs a CPA secure threshold CP-ABE scheme, which can be further upgraded to the CCA security and proves the security of the schemes can be ...

CP-ABE is very appealing since the ciphertext and data access policies are integrated together in a natural and effective way. However, all existing CP-ABE ...