Attribute Based Encryption with Privacy Preserving In Clouds

Abstract

Security and privacy are very important issues in cloud computing. In existing system access control in clouds are centralize d in nature. The scheme uses a symmetric key approach and does not supp ort authentication. Symmetric key algorithm uses same key for both encryption and decryption. The authors take a centralized approach where a single key distribution center (KDC) distribute secret keys and attributes to all users. A new decentralized acce ss control scheme for secure data storage in clouds that supports anonymous authentication. The validity of the user who stores the data is also verified. The proposed scheme is resilient to replay attacks. In this scheme using Secure Hash algorithm for au thentication purpose, SHA is the one of several cryptographic hash functions, most often used to verify that a file has been unaltered. The Paillier crypto system, is a probabilistic asymmetric algorithm for public key cryptography. Paillier algorithm used f or Creation of access policy, file accessing and file restoring process.