International Journal of Computational Engineering Research||Vol, 03||Issue, 10|| ||Issn 2250-3005 || ||October||2013|| Page 11 THEMIS: A Mutually Verifiable Billing Transactions For Cloud Computing Environment B.Harshini 1 , M. Venkata Krishna Reddy 2 1 M.Tech Scholar, CSE Dept Jayaprakash Narayan College of Engg. Mahabubnagar, Andhra Pradesh. 2 Assoc. Professor, CSE Dept, Jayaprakash Narayan College of Engg. Mahabubnagar, Andhra Pradesh. I. INTRODUCTION Cloud computing is an important transition that makes change in service oriented computing technology. Cloud service provider follows pay-as-you-go pricing approach which means consumer uses as many resources as he need and billed by the provider based on the resource consumed. CSP give a quality of service in the form of a service level agreement. For transparent billing, each billing transaction should be protected against forgery and false modifications. Although CSPs provide service billing records, they cannot provide trustworthiness. It is due to user or CSP can modify the billing records. In this case even a third party cannot confirm that the user’s record is correct or CSPs record is correct. To overcome these limitations we introduced a secure billing system called THEMIS. For secure billing system THEMIS introduces a concept of cloud notary authority (CNA). CNA generates mutually verifiable binding information that can be used to resolve future disputes between user and CSP. This project will produce the secure billing through monitoring the service level agreement (SLA) by using the S-Mon module. CNA can get a service logs from S-Mon and stored it in a local repository for further reference. Even administrator of a cloud system cannot modify or falsify the data. II. EXISTING SYSTEM The billing systems with limited security concerns and the micropayment-based billing system require a relatively low level of computational complexity: the non obstructive billing transaction latency is 4.06 ms for the former and 4.70 ms for the latter. Nevertheless, these systems are inadequate in terms of transaction ABSTRACT : With the widespread adoption of cloud computing, the ability to record and account for the usage of cloud resources in a credible and verifiable way has become critical for cloud service providers and users alike. The success of such a billing system depends on several factors: the billing transactions must have integrity and non-repudiation capabilities; the billing transactions must be non obstructive and have a minimal computation cost; and the service level agreement (SLA) monitoring should be provided in a trusted manner. Existing billing systems are limited in terms of security capabilities or computational overhead. In this paper, we propose a secure and non-obstructive billing system called THEMIS as a remedy for these limitations. The system uses a novel concept of a cloud notary authority for the supervision of billing. The cloud notary authority generates mutually verifiable binding information that can be used to resolve future disputes between a user and a cloud service provider in a computationally efficient way. Furthermore, to provide a forgery-resistive SLA monitoring mechanism, we devised a SLA monitoring module enhanced with a trusted platform module (TPM), called S-Mon. The performance evaluation confirms that the overall latency of THEMIS billing transactions (avg. 4.89 ms) is much shorter than the latency of public key infrastructure (PKI)-based billing transactions (avg. 82.51 ms), though THEMIS guarantees identical security features as a PKI. This work has been undertaken on a real cloud computing service called iCube Cloud. KEYWORDS: Non-obstructive, Non-repudiation, Verification, pricing, Records, Resource allocation and Transaction processing.