Ciphertext Policy Attribute based Encryption with anonymous access policy

TL;DR

This paper introduces a privacy-preserving CP-ABE scheme where the access policy is not transmitted with the ciphertext, enhancing encryptor privacy while maintaining security under standard assumptions.

Contribution

It proposes a novel CP-ABE scheme that hides the access policy from the ciphertext, improving privacy without compromising security.

Findings

The scheme is provably secure under Decision Bilinear Diffe-Hellman assumption.

The access policy remains confidential and is not transmitted with the ciphertext.

The method preserves privacy while maintaining cryptographic security.

Abstract

In Ciphertext Policy Attribute based Encryption scheme, the encryptor can fix the policy, who can decrypt the encrypted message. The policy can be formed with the help of attributes. In CP-ABE, access policy is sent along with the ciphertext. We propose a method in which the access policy need not be sent along with the ciphertext, by which we are able to preserve the privacy of the encryptor. The proposed construction is provably secure under Decision Bilinear Diffe-Hellman assumption.