Attribute-based encryption is a promising solution to the access control based data sharing
in the cloud. In this scheme, access policies are being sent in plaintext form which discloses
the user privacy and data privacy. Once the ciphertext has been shared among the set of
authorized users they would be able to decrypt the ciphertext. Whenever the authorized
users are acting as malicious users, they may alter the data and further encrypt and
outsource the modified data. It may adversely affect the data owner. In the existing attribute …