Expressive, Efficient, and Revocable Data Access Control for Multi-Authority Cloud Storage

Expressive, Efficient, and Revocable Data Access Control for Multi-Authority Cloud Storage

ABSTRACT:

Data access control is an effective way to ensure the data security in the cloud. Due to data outsourcing and untrusted cloud servers, the data access control becomes a challenging issue in cloud storage systems. Ciphertext-Policy Attributebased Encryption (CP-ABE) is regarded as one of the most suitable technologies for data access control in cloud storage, because it gives data owners more direct control on access policies. However, it is difficult to directly apply existing CP-ABE schemes to data access control for cloud storage systems because of the attribute revocation problem. In this paper, we design an expressive, efficient and revocable data access control scheme for multi-authority cloud storage systems, where there are multiple authorities co-exist and each authority is able to issue attributes independently. Specifically, we propose a revocable multi-authority CP-ABE scheme, and apply it as the underlying techniques to design the data access control scheme. Our attribute revocation method can efficiently achieve both forward security and backward security. The analysis and simulation results show that our proposed data access control scheme is secure in the random oracle model and is more efficient than previous works.

EXISTING SYSTEM:

This new paradigm of data hosting and data access services introduces a great challenge to dataaccess control. Because the cloud server cannot be fully trusted by data owners, they can no longer rely on servers to do access control. Ciphertext-Policy Attribute-based Encryption (CP-ABE) is regarded as one of the most suitabletechnologies for data access control in cloud storage systems,because it gives the data owner more direct control on access policies. In CP-ABE scheme, there is an authority that is responsible for attribute management and key distribution.

DISADVANTAGES OF EXISTING SYSTEM:

·        Chase’s multi-authority CP-ABE protocol allows the central authority to decrypt allthe ciphertexts, since it holds the master key of the system.

·        Chase’s protocol does not support sattribute revocation.

PROPOSED SYSTEM:

In this paper, we first propose a revocable multiauthority CP-ABE scheme, where an efficient and secure revocation method is proposed to solve the attribute revocation problem in the system. Our attribute revocation method is efficient in the sense that it incurs less communication cost and computation cost, and is secure in the sense that it can achieve both backward security (The revoked user cannot decrypt any new ciphertext that requires the revoked attribute to decrypt)and forward security (The newly joined user can also decrypt the previously published ciphertexts1, if it has sufficient.attributes). Our scheme does not require the server to be fully trusted, because the key update is enforced by each attribute authority not the server. Even if the server is not semitrusted in some scenarios, our scheme can still guarantee the backward security. Then, we apply our proposed revocable multi-authority CP-ABE scheme as the underlying techniques to construct the expressive and secure data access control scheme for multi-authority cloud storage systems.

ADVANTAGES OF PROPOSED SYSTEM:

·        We modify the framework of the scheme and make it more practical to cloud storage systems, in which data owners are not involved in the key generation.

·        We greatly improve the efficiency of the attribute revocation method.

·        We also highly improve the expressiveness of our access control scheme, where we remove the limitation that each attribute can only appear at most once in a ciphertext.

SYSTEM REQUIREMENTS:

HARDWARE REQUIREMENTS:

Ø System                          :         Pentium IV 2.4 GHz.

Ø Hard Disk                      :         40 GB.

Ø Floppy Drive                 :         1.44 Mb.

Ø Monitor                         :         15 VGA Colour.

Ø Mouse                            :         Logitech.

Ø Ram                               :         512 Mb.

SOFTWARE REQUIREMENTS:

Ø Operating system           :         Windows XP/7.

Ø Coding Language :         JAVA/J2EE

Ø IDE                      :         Netbeans 7.4

Ø Database              :         MYSQL

REFERENCE:

Kan Yang, Student Member, IEEE, and Xiaohua Jia, Fellow, IEEE“Expressive, Efficient, and Revocable Data Access Control for Multi-Authority Cloud Storage” IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS,VOL. 25,NO. 7,JULY 2014.