Balancing Performance, Accuracy, and Precision for Secure Cloud Transactions

Balancing Performance, Accuracy, and Precision for Secure Cloud Transactions

ABSTRACT:

In distributed transactional database systems deployed over cloud servers, entities cooperate to form proofs of authorizations that are justified by collections of certified credentials. These proofs and credentials may be evaluated and collected over extended time periods under the risk of having the underlying authorization policies or the user credentials being in inconsistent states. It therefore becomes possible for policy-based authorization systems to make unsafe decisions that might threaten sensitive resources. In this paper, we highlight the criticality of the problem. We then define the notion of trusted transactions when dealing with proofs of authorization. Accordingly, we propose several increasingly stringent levels of policy consistency constraints, and present different enforcement approaches to guarantee the trustworthiness of transactions executing on cloud servers. We propose a Two-Phase Validation Commit protocol as a solution, which is a modified version of the basic Two-Phase Validation Commit protocols. We finally analyze the different approaches presented using both analytical evaluation of the overheads and simulations to guide the decision makers to which approach to use.

EXISTING SYSTEM:

To provide scalability and elasticity, cloud services oftenmake heavy use of replication to  ensure consistent performance and availability. As a result, many cloud services rely on the notion of eventual consistency when propagating data throughout the system. This consistency model is a variant of weak consistency that allows data to be inconsistent among some replicas during the update process, but ensures that updates will eventually be propagated to all replicas.

DISADVANTAGES OF EXISTING SYSTEM:

Ø Consistency problems can arise as transactional database systems are deployed in cloud environments and use policy-based authorization systems to protect sensitive resources.

Ø The system may suffer from policy inconsistencies during policy updates.

Ø It is possible for external factors to cause user credential inconsistencies over the lifetime of a transaction.

PROPOSED SYSTEM:

Ø We formalize the concept of trusted transactions.

Ø We define several different levels of policy consistency constraints and corresponding enforcement approaches that guarantee the trustworthiness of transactions executing on cloud servers.

Ø We propose a Two-Phase Validation Commit (2PVC) protocol that ensures that a transaction is safe by checking policy, credential, and data consistency during transaction execution.

Ø We carry out an experimental evaluation of our proposed approaches.

ADVANTAGES OF PROPOSED SYSTEM:

Ø Identifies transactions that are both trusted and conform to the ACID properties of distributed database systems.

Ø Guarantee the trustworthiness of transactions executing on cloud servers.

Ø A transaction is safe by checking policy, credential, and data consistency during transaction execution.

Ø Most suitable in various situations.

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 :         ASP.net, C#.net

Ø Tool                     :         Visual Studio 2010

Ø Database              :         SQL SERVER 2008

REFERENCE:

Marian K. Iskander, Tucker Trainor, Dave W. Wilkinson, Adam J. Lee, and Panos K. Chrysanthis, “Balancing Performance, Accuracy, and Precision for Secure Cloud Transactions”, VOL. 25, NO. 2, FEBRUARY 2014.